Eleven people have been killed, officials say, in a gun attack on a synagogue in the city of Pittsburgh, Pennsylvania.
The gunman, who opened fire as the Tree of Life synagogue held a service, was later taken into custody.
President Donald Trump said “a lot of people” had been killed and injured in a “wicked act of mass murder”.
The suspect has not been officially identified but US media have named him as Robert Bowers, 46.
Federal investigators are treating the shooting as a hate crime.
How did the shooting unfold?
Worshippers had gathered at the synagogue, in the Squirrel Hill neighbourhood, to mark the Sabbath.
Squirrel Hill has one of the largest Jewish populations in Pennsylvania and this would have been the synagogue’s busiest day of the week.
According to reports, a heavy-set white male armed with an assault rifle and two pistols, entered the building during the Saturday morning service.
Reports say the gunman barricaded himself in a room at the synagogue.
Emergency services arrived at the building at about 10:00 local time (14:00 GMT), and gunshots could be heard.
Pittsburgh’s Public Safety Director Wendell Hissrich later confirmed the gunman was in police custody and was being treated in hospital.
The crime scene was “horrific”, he told reporters. “One of the worst I’ve seen, and I’ve [worked] on some plane crashes. It’s very bad,” he added.
What do we know about the gunman?
US media said he had shouted “All Jews must die” as he carried out the attack.
Although his identity has not been confirmed by the authorities, anonymous law enforcement officials are widely quoted by US media as saying he is 46-year-old Pittsburgh man Robert Bowers.
Social media posts by someone of that name are reported to be full of anti-Semitic comments.
What has been President Trump’s reaction?
He called the shooting a “terrible, terrible thing”.
“To see this happen again and again, for so many years, it’s just a shame,” he told reporters on Saturday.
He described the gunman as a “maniac” and suggested the US should “stiffen up our laws of the death penalty”.
“These people should pay the ultimate price. This has to stop,” he said.
Mr Trump added that the incident had “little to do” with US gun laws. “If they had protection inside, maybe it could have been a different situation,” he said.
The president later appeared at the Future Farmers of America Convention in Indianapolis, saying: “There must be no tolerance for anti-Semitism. It must be condemned and confronted everywhere and anywhere it appears.”
What about other reaction?
Pennsylvania Governor Tom Wolf said in a statement that the incident was an “absolute tragedy” and that such acts of violence could not be accepted as “normal”.
He said: “These senseless acts of violence are not who we are as Americans.
“My thoughts right now are focused on the victims, their families and making sure law enforcement has every resource they need.”
The Jewish Federation of Greater Pittsburgh’s president, Jeff Finkelstein, said his “heart goes out to all these families”.
“Now I’m just sad. This should not be happening. Period. It should not be happening in a synagogue. It should not be happening in our neighbourhood here in Squirrel Hill,” he said.
A vigil is due to take place in Squirrel Hill at 18:00 local time on Saturday.
The New York Police Department said it had deployed officers to synagogues throughout the city as a precaution.
The BBC’s Dan Johnson in Washington says the shootings come at a tense time in the US, after a week in which mail bombs were sent to critics of Mr Trump, ahead of crucial mid-term elections next month.
BBC
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