BOSTON — Cybersecurity teams worked feverishly Sunday to stem the impact of the single biggest global ransomware attack on record, with some details emerging about how the Russia-linked gang responsible breached the company whose software was the conduit.

An affiliate of the notorious REvil gang, best known for extorting $11 million from the meat-processor JBS after a Memorial Day attack, infected thousands of victims in at least 17 countries Friday, largely through firms that remotely manage IT infrastructure for multiple customers, cybersecurity researchers said. They reported ransom demands of up to $5 million.

The FBI said Sunday that it was investigating the attack along with the federal Cybersecurity and Infrastructure Security Agency, though “the scale of this incident may make it so that we are unable to respond to each victim individually.”

President Joe Biden suggested Saturday that the U.S. would respond if it was determined that the Kremlin is at all involved. He said he had asked the intelligence community for a “deep dive” on what happened.

The attack comes less than a month after Biden pressed Russian President Vladimir Putin to stop providing safe haven to REvil and other ransomware gangs whose unrelenting extortionary attacks the U.S. deems a national security threat.

A broad array of businesses and public agencies were hit by the latest attack, apparently on all continents, including in financial services, travel and leisure and the public sector — though few large companies, the cybersecurity firm Sophos reported.

Ransomware criminals break into networks and sow malware that cripples networks on activation by scrambling all their data. Victims get a decoder key when they pay up.

CEO Fred Voccola of the breached software company, Kaseya, estimated the victim number in the low thousands, mostly small businesses like “dental practices, architecture firms, plastic surgery centers, libraries, things like that.”

Japanese mudslide: More than 1,000 soldiers, firefighters and police Sunday waded through a giant mudslide that ripped through a resort town southwest of Tokyo, killing at least two people and leaving about 20 missing as it swept away houses and cars.

Prime Minister Yoshihide Suga told reporters 19 people had been rescued, and 130 homes and other buildings were damaged in Atami.

Two people were dead, but more were feared missing, he said speaking after an emergency Cabinet meeting.

“The area is still having heavy rainfall, but arduous rescue efforts will continue,” Suga said, warning residents to watch out for more landslides. “Please act as quickly as you can to stay safe.”

The mudslide early Saturday crashed down a mountainside into rows of houses following heavy rains that began several days ago. Bystanders, their gasps of horror audible, caught the scene on cellphone video.

Witnesses said they heard a giant roar and then watched helplessly as homes got gobbled up by the muddy waves.

The area of Atami where the mudslide struck, Izusan, is a seaside resort about 60 miles southwest of Tokyo. It’s known for hot springs, a shrine and shopping streets.

Cyprus fire: Cyprus search crews discovered four charred bodies outside a fire-swept mountain village Sunday in what the interior minister called the “most destructive” blaze in the eastern Mediterranean island nation’s history.

Interior Minister Nicos Nouris said Civil Defense volunteers discovered the remains just outside the village of Odou on the southern edge of the Troodos mountain range.

The blaze, which began Saturday afternoon outside the village of Arakapas, spread quickly amid strong winds and forced the evacuation of at least eight mountain villages, destroying homes and scorching 21 square miles of pine forest and orchards.

“We are experiencing the most destructive fire since the founding of the Cyprus republic,” Nouris said, adding that 50 homes were damaged so far.

Authorities believe the bodies belong to four Egyptian laborers aged 22 to 29 who had gone missing Saturday evening. Nouris said he has spoken to the Egyptian ambassador to Cyprus and that arrangements will be made to repatriate the remains.

French far right: French far-right leader Marine Le Pen says she will stick with her strategy of making her party a more mainstream political force despite a stinging loss in France’s regional elections, and that tactic will carry her into next year’s presidential race.

Le Pen, 52, was reelected Sunday as the head of the National Rally at a party gathering in the southern town of Perpignan.

Her anti-immigration party failed to win any of mainland France’s 12 regions in last week’s vote, raising criticism about Le Pen’s strategy. Some members deplored her choice to tame the party’s extremist edge and accused her of ignoring grassroots members, warning this could cost her votes.

In her speech, Le Pen instead praised the “healthy and necessary development” of the party and said there will be no return to the National Front, the former name of the party that was changed in 2018. The rebranding was part of a broader strategy to revive the nationalist movement after her defeat by centrist Emmanuel Macron in France’s 2017 presidential race.

Le Pen also confirmed she would be a candidate in France’s 2022 presidential election. Polls show she is in a position to reach the runoff, possibly facing Macron again.

Texas shooting: Eight people were wounded early Sunday when a person began shooting toward groups of people near a Fort Worth car wash and multiple people returned fire, police said.

Police said in a statement that the eight gunshot victims were taken to hospitals and were in stable condition. Police said no suspects were in custody.

Police said an officer in the area heard gunshots at about 1:30 a.m. and when officers arrived, they found the eight people who had been shot.

Police said Sunday afternoon that detectives had determined the shooting began following an argument between several men. Police said one person then left the scene, retrieved a gun and began shooting toward groups of people.

Police said multiple people in the area then returned fire. Most of those wounded were innocent bystanders, police said.

Fort Worth police Chief Neil Noakes said officers provided medical care to the injured on arrival.

A juvenile female had minor injuries after being stuck by a vehicle, police said.