U.S. authorities investigated on Monday whether anyone helped the gunman who massacred 49 people at a gay nightclub in Orlando, but said they did not believe anyone connected to the shooting posed a current danger to the public.
The FBI and other agencies were looking at evidence inside and in the closed-off streets around the Pulse nightclub, where a shooter pledging allegiance to Islamic State carried out the deadliest mass shooting committed by a non-state actor in U.S. history, and the worst attack on U.S. soil since Sept. 11, 2001.
The gunman, Omar Mateen, a New York-born Florida resident and U.S. citizen who was the son of Afghan immigrants, was shot and killed by police who stormed the club early Sunday morning with armored cars after a three-hour siege.
Officials said on Sunday the death toll was 50. On Monday they clarified that this included Mateen.
By Monday morning, all but one of those killed had been identified and about half the families of the dead had been notified, officials said.
Julissa Leal, 18, and her mother drove down to the Florida city from Lafayette, Louisiana in search of her brother, 27-year-old Frank Hernandez. They knew he was at the club with his boyfriend, who lost him in the chaos.
"We haven't heard anything, don't know anything," Leal said said, fighting back tears. "I'm going to see him again. I'm going to see him again."
Law enforcement officials were looking for clues as to whether anyone worked with Mateen on the attack, said Lee Bentley, U.S. Attorney for Florida's middle district.
"There is an investigation of other persons, we are working as diligently as we can on that," Bentley told a news conference. "If anyone else was involved in this crime, they will be prosecuted."
Officials stressed they believed there had been no other attackers and that they had no evidence of a threat to the public.
Mateen, 29, called emergency services during the shooting and pledged allegiance to the leader of the militant Islamic State group, officials said. His father said on Sunday his son was not radicalized, but indicated Mateen had strong anti-gay feelings. His ex-wife described him as mentally unstable and violent toward her.
The Islamic State group reiterated on Monday a claim of responsibility. "One of the Caliphate's soldiers in America carried out a security invasion where he was able to enter a crusader gathering at a nightclub for homosexuals in Orlando," the group said in a broadcast on its Albayan Radio
Although the group claimed responsibility, this did not necessarily mean it directed the attack: there was nothing in the claim indicating coordination before the rampage between the gunman and the Islamist organization.
The attack, denounced by President Barack Obama as an act of terror and hate, reignited the debate over how best to confront violent Islamist militancy, and immediately became a sharp point of disagreement in the campaign for the Nov. 8 presidential election.
Democratic candidate Hillary Clinton, speaking on MSNBC, said the United States should walk a fine line in bolstering security without demonizing Muslims, and also called for tougher gun safety measures. Trump, in CNN and Fox News interviews, criticized the U.S. Muslim population for not reporting suspicions to authorities, and reiterated his call for a temporary ban on Muslims entering the country.
The rampage began just after 2 a.m. on Sunday at the nightclub in the heart of Orlando, about 15 miles (25 km) northeast of the Walt Disney World Resort. Orlando is one of the most popular tourist destinations in the United States, drawing some 62 million visitors a year.
Some 350 patrons were attending a Latin music event at the club and survivors described scenes of carnage and pandemonium as the shooter took hostages inside a bathroom.
Police said on Monday that the officers who responded to the attack saved "dozens" of clubgoers and eventually used explosives and a heavy vehicle to punch a hole in the building's wall through which more people escaped. Mateen also emerged through the hole and was shot dead, police said.