“Heaven” is how Peter Jamieson describes his home in Scotland, with its uninterrupted view of Loch Ness and the green hills stretching beyond, seemingly forever. But there is a problem in paradise, and it has nothing to do with the mythical aquatic monster that brought fame to the area.

Centuries after being hunted to extinction, wild boars are back, roaming the hills and roads around the lake. And so Mr. Jamieson, who lives not far from the village of Drumnadrochit, often wakes to discover his front lawn plowed as if by an excavator.

Elsewhere in the area, some farmers have been greeted by bloody lamb carcasses on their land. And drivers on local roads have encountered traveling boars, which can run at up to 30 miles an hour, according to one local resident, who said a friend’s car collided with a 132-pound animal, totaling the vehicle, as well as killing the boar.

Mr. Jamieson, a former police officer who runs a real estate business from his home, first noticed something amiss around six years ago when his lawn was torn to pieces. He said he has to patch the grass five or six times a year and is afraid to let his dogs run freely. This has brought mixed emotions.

“I don’t like seeing animals killed at all, even a rabbit,” he said, standing outside his home with its spectacular view of the loch. Boars, however, are different, he added.

Since he first noticed the problem, he has had to hire hunters to shoot around 50 boars on his 8.5 acres of land, including one whose carcass weighed about 309 pounds. “I took a look at it,” he said. “My god, I’d never seen teeth like it.”

Nearby, close to the village of Grotaig, Catherine Mclennan, 52, recalled a close call one night when she shone a flashlight at what turned out to be a boar. “I looked at it. It looked at me,” said Ms. Mclennan, a fifth-generation farmer. “It was a scary moment because I thought, ‘What the hell do I do with this?’”

The animal disappeared before she had to decide. But two lambs she left out overnight were not so lucky.

“I went down the next morning to look for them, and the carcass was literally bare,” she said, referring to one of the lambs and speaking close to the paddock where she keeps three horses. “The fleece was at the back end literally in a big lump, and you are like, ‘What the heck, what’s doing this?’”

In fact, boars spend much of their time foraging for roots, using their snouts to turn over land. But they also eat smaller creatures, including lambs, small deer and ground-nesting birds like pheasant and grouse, and their eggs.

Once native to Scotland, boars were hunted to extinction, probably around the 13th century. Several attempts to reintroduce them for hunting foundered. Then, sometime in the 20th century, a few that had been imported from continental Europe escaped or were released from captivity, probably after having been brought to country estates as a novelty, local residents suspect.

These days, Scotland’s population of boars — or feral pigs — may have “reached the low thousands,” according to NatureScot, the agency that advises the Scottish government on wildlife and other similar issues. But local residents believe that is an underestimate, and some say the agency isn’t doing enough to help.

“The Scottish government needs to take more action as well as compensating farmers for the damage that’s been done to their livestock and damage that’s being done to their ground,” Ms. Mclennan said.

NatureScot declined to make an official available for an interview, but said in a statement that it recognized that boars can “breed prolifically and, if uncontrolled, their rooting behavior can cause damage to the environment and to property.”

The bottom line, the agency says, is that the responsibility for dealing with the boars lies with landowners.

When Mr. Jamieson needed to address his boar problem, he turned to Robert Sanderson, 41, an ambulance dispatch controller whose side business, Highland Deer Management, helps landowners cope with the sometimes exploding local deer population. Mr. Sanderson shoots the deer and sells the meat. But boars have become a significant part of his work, he said.

On a recent night, Mr. Sanderson drove along the loch with his business partner, Grant Clark, 32, who works in auto repairs. The men, who both live in Inverness, made their way to a hide-out with a view of an open hillside and waited for a while, but no boar showed up. So they thought they were done for the evening.

But 10 minutes after he left the area, Mr. Sanderson’s phone pinged when a boar triggered a sensor on a camera trap near the hillside.

Mr. Sanderson studied the image — “probably going to be 50 kilos-ish” — before he and Mr. Clark hurried back to a vantage point. They concluded that the boar was a solitary female, without youngsters that would starve without it, and therefore a legitimate target.

Minutes later, a single shot rang out as a boar was struck just below the ear, killing it instantly. The animal rolled a few feet downhill and lay prone.

Mr. Sanderson cut into the boar, removing its intestines for other animals to forage, and dragged away the heavy carcass to sell for meat.

Not everyone near the loch is unhappy to see boars in the neighborhood.

Alex Davies is the estate manager at Bunloit, a 1,200-acre property purchased in 2020 by Highlands Rewilding, an environmental group. He called the animals “ecosystem engineers” who “rotovate” the ground, allowing in new plants and bolstering biodiversity.

According to a drone survey, the estimated boar population on Bunloit stands at 29, and Mr. Davies said it may even be declining because the estate’s animals roam on other land where they might be hunted.

Mr. Davies acknowledged that boars can cause problems, but said that other places where they have returned — like the Forest of Dean, near England’s border with Wales, where he previously worked — have been fine.

“Back then, 30 years ago, there was a lot of talk about them being dangerous, the numbers increasing, all type of scare stories, none of which came to pass,” he said.

Thirty miles away, Richard Tuxford, a hunting enthusiast who owns an estate at Invergarry, said, “I love all wildlife, and it’s just about controlling it.”

“Everybody and everything are welcome here, all in balance,” he added, standing outside Tomdoun Lodge, his home on the estate, which stretches over more than 11,000 acres of dramatic scenery and was once visited by J.M. Barrie, the creator of Peter Pan.

Boars are skilled at hiding and can be “like the scarlet pimpernel,” but sometimes break cover and reveal their swelling numbers, Mr. Tuxford said.

He recalled driving home one night to find his path blocked by a dozen boars of mixed size, trotting in a line down the road in the direction of his home. Not all of them made it.

“I shot one that night,” he said. “We hung that one up in the larder.”

Italian authorities said on Saturday that they had opened a manslaughter investigation into the sinking of the Bayesian luxury yacht, but that they had not yet zeroed in on any potential suspects.

The sleek, $40 million sailing boat went down fast in a storm off Sicily’s coast on Monday morning, killing Michael Lynch, a British tech billionaire; his teenage daughter, Hannah; four of his friends; and one member of the crew. The captain escaped on a lifeboat with 14 others.

On Saturday, Ambrogio Cartosio, the prosecutor in charge of the case, said at a news conference that it was “plausible” crimes were committed during the accident.

“There could be responsibilities of the captain only,” he said. “There could be responsibilities of the whole crew. There could be responsibilities of the boat makers. Or there could be responsibilities of those who were in charge of surveilling the boat.”

Here is what the authorities said on Saturday:

• It will be difficult to determine the cause of the sinking until the yacht is brought to the surface and inspected, which could take weeks.

• Five bodies were found in the same cabin.

• The yacht sank at an angle, with the stern — where the heavy engine is situated — having gone down first.

• The captain and the crew, who have been holed up in a Sicilian hotel with other survivors, are allowed to leave Italy. But prosecutors said that they still want to ask them more questions.

• The authorities did not perform alcohol or drug tests on the captain or the crew.

• The authorities would not comment on whether hatches on the deck had been left open, which would have allowed water to pour in during the yacht’s sinking.

• In addition to possible manslaughter charges, the authorities are also investigating the possibility of a negligently caused shipwreck, a crime that carries up to several years in prison upon conviction.

Investigators said they were focusing on why the 184-foot-long Bayesian, which was built in 2008, went down so quickly, especially when other yachts nearby weathered the storm.

Executives at the company that built the boat have said there is nothing faulty with the design of the yacht and have tried to shift the blame to the crew.

At the news conference on Saturday, the authorities were asked why the captain, James Cutfield, an experienced sailor, left the sinking boat while some passengers were still on board.

“The investigations are also focusing on this,” said Raffaele Cammarano, another prosecutor. But he added that the witnesses they had spoken to said that “the event was really, really sudden.”

Some people who were along the Sicilian coast at the time of the sinking described seeing waterspouts, which are vicious funnels of water and wind that sweep across a body of water during thunderstorms. But on Saturday, Italian authorities said they believed it was more likely that a downburst occurred at the time of the accident.

A downburst is a blast of powerful wind that comes surging down from the sky during thunderstorms. The Italian authorities said that extreme weather was “one of the main elements” of their investigation, but added that they were still at the early stages of their inquiry and that they did not want to “play the probability game.”

The rescuers found the bodies of five passengers in one cabin, which was on the left side of yacht. The yacht was found lying on its right side at the bottom of a bay, in about 160 feet of water. The authorities said the passengers who died were most likely trying to flee to the higher side of the boat and were probably sleeping when the accident happened.

The authorities said that they were not certain whether a black box existed and that the hull was still being searched.

Mr. Cartosio would not comment directly on the actions of the crew, but said that it would be “even more painful” if “the sinking was caused by behaviors that were not perfectly in order with the responsibilities that each person must have in the management of navigation.”

But he added that “this is just, in fact, the beginning of an inquiry.”

German police officers are hunting for a man who on Friday night attacked nearly a dozen people with a knife, killing three, during a street festival in the western city of Solingen.

On Saturday evening the police made an arrest in the case, but would not say whether they believed the person was the attacker.

“One man has been arrested and we are now determining how he is connected to the attack,” a spokeswoman with the Düsseldorf police said on Saturday evening.

At a news conference on Saturday afternoon, the authorities said they had not ruled out a terrorist attack because no other explanation for the seemingly random violence made sense.

The police said they had detained a 15-year-old boy for questioning whom they believed might have had prior knowledge of the attack. The state attorney is not treating the youth as a suspect.

What happened?

Shortly after 9:30 p.m., the attacker started stabbing people who had gathered at the festival to celebrate the 650th anniversary of Solingen — a city famous for its knives and scissors. The attack occurred during a live music performance, not far from a temporary stage set up for the event, which was billed as a “Festival of Diversity.”

The police said it appeared that the attacker had chosen victims from the crowd at random and that he appeared to have targeted at least one of the victims’ necks.

The festival, originally planned to run through Sunday, was immediately canceled as emergency workers tended to the injured and the police tried to get a handle on the situation.

On Saturday, the police said a woman and a man, both 57, and another man, 67, had been killed. They did not give further details. Besides the three dead, eight were injured. Of those, four remained in critical condition.

The police have interviewed witnesses and survivors to try to reconstruct the attack and have asked the public to upload any videos or photographs of the event to the official tip site of the state police.

Early Saturday morning, the police raided the house of the 15-year-old boy, whom several witnesses said they had overheard communicating with the suspect before the attack. The public prosecutor said the boy was being investigated for not reporting a crime.

On Saturday evening, the German equivalent of a S.W.A.T. unit arrested a suspect in a temporary home for refugees in the vicinity of the attack. The police were trying to confirm whether the person was the attacker.

What’s next?

“Our authorities are doing everything they can to catch the perpetrator and to determine the background of the attack,” Nancy Faeser, Germany’s interior minister, said in a statement on Saturday. Officers from neighboring areas have been brought in to try to help the local police find the attacker.

Federal police have also been involved in the search, the authorities said Saturday. The federal prosecutor’s office, which would take over the case if it was officially deemed act of terrorism, is on standby, with two members of its staff already in Düsseldorf observing the case.

The police have so far declined to make public any details about the man, saying that there were too many conflicting descriptions from witnesses. “Nothing would be more damaging than to put out a description, call on the public to help with the search and then, in the course of the investigation, discover that the person in question looks completely different after all,” Marcel Fiebig, a spokesman for the Düsseldorf police, said during Saturday’s news conference.

That has not stopped the tabloid Bild from releasing a description of the man as a “Mediterranean type,” wearing a dark beard. Members of Germany’s far-right AfD party, which has made violent crimes committed by young male immigrants one of its main talking points, reacted swiftly.

Before the police had confirmed any of the descriptions, Tino Chrupalla, a leader of the far-right AfD, wrote in a post on X: “A ban on knives will not help to prevent such situations. Germany needs an immediate change in its migration and security policy!”

The anti-immigrant party is poised to make gains in three state elections next month.

Two nearby towns have also canceled public festivals that they had planned for the weekend. “We cannot celebrate when our neighboring city is mourning just a few kilometers away,” said Bettina Warnecke, the mayor of Haan, which canceled its wine festival. In comments reported by the D.P.A., a German news service, Ms. Warnecke noted that security was also an issue, given that the police had not found the man they believed to be the attacker.

“The perpetrator must be caught quickly and punished with the full force of the law,” Chancellor Olaf Scholz said in a statement posted to his X account on Saturday.

What are some key facts about Solingen?

Solingen, home to more than 150,000 people, is just east of Düsseldorf, the capital of Germany’s most populous state, North Rhine-Westphalia.

Known around the world for the production of high-end knives and scissors, Solingen calls itself the “city of blades.” The attack happened in the busy square at the heart of the festival celebrating the 650th anniversary of the first written mention of the city.

Solingen is a diverse city that has benefited from foreign workers since the guest worker programs of the 1960s brought foreign workers to the city’s many blade manufacturers. More than 20 percent of the city’s residents are not German citizens, and thousands more hold dual citizenship.

The city was the site of one of the most traumatizing racist attacks in postwar Germany, in 1993, when a group of young neo-Nazis set fire to a house inhabited by a Turkish family. Five people were killed, including three children, and 17 people were injured.