ISIS-linked news agency claims responsibility for shooting rampage at gay nightclub that left 50 dead
Orlando nightclub shooting
Orlando nightclub shooting

(AP)
Family members waiting for word from the police after arriving down the street from the shooting at the Pulse gay nightclub in Orlando, Florida.

The ISIS-affiliated news agency Amaq News broadcast a claim of responsibility from ISIS for a shooting rampage at a gay nightclub in Orlando that left 50 people dead over the weekend.

The agency said the shooting was the work of an "ISIS fighter," multiple media outlets have reported.

The gunman, identified as 29-year-old Omar Mateen, called 911 sometime Saturday night and pledged allegiance to ISIS, mentioning the Boston marathon bombers during the call.

Sen. Bill Nelson of Florida said Sunday in a news conference that Mateen, who was from Fort Pierce, Florida, had "some connection to ISIS," and Rep. Adam Schiff — the ranking Democrat on the House Intelligence Committee — said Mateen had pledged allegiance to ISIS, according to information he had received from the Department of Homeland Security.

"This is clearly an act of terror," Gov. Rick Scott of Florida said in a news conference on Sunday. President Barack Obama called the shooting an "act of terror" and "an act of hate."

Law enforcement confirmed that the incident was being treated as an act of terrorism.

Mateen was on an FBI list of suspected ISIS sympathizers and was looked into by federal authorities once in 2013 and again in 2014. He was the subject of a brief FBI investigation in 2014 before the case was closed.

"The FBI first became aware of Mateen in 2013, when he made threats to coworkers, including possible ties to terrorist activities," an FBI spokesman said Sunday in a news conference.

"In 2014, Mateen again came to the attention to the FBI because of possible ties to an American suicide bomber, Moner Abusalha. The FBI interviewed Mateen and determined that contact was minimal and did not constitute a substantive threat at the time."

Mateen legally purchased the two firearms used in the attack on the nightclub — a handgun and a long gun — in the past few days, a police spokesman said in a news conference on Sunday.

'ISIS-directed' versus 'ISIS-inspired'

Mateen's connection to ISIS does not necessarily mean he was in direct contact with the radical jihadists or that the group directed him to carry out the attack. Nelson, the Florida senator, noted that the apparent connection to ISIS was not "official," and US officials, speaking on the condition of anonymity, told Reuters they had yet to uncover direct contacts between the gunman and any extremist group.

"There is a big difference between ISIS-directed and ISIS-inspired," national-security analyst Juliette Kayyem said on CNN.