Investigators are looking at reports that Mateen visited gay clubs and was using gay dating apps, a law enforcement official said. Also Monday, officials said Mateen appeared to have been radicalized by Islamic extremists on the Internet but expressed sympathies with radical groups that violently oppose each other.

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Orlando resident Cord Cedeno told TMZ he first connected with Mateen a few years ago on Grindr, where the killer just said “Hi,” over and over.

Mateen used another app, Adam4Adam, to send shots of his privates to men, never showing his face, according to Cedeno, who said he doesn’t know if the killer ever hooked up with a man, the site reported.

Cedeno said he eventually wound up blocking Mateen, whose profile pic showed him wearing a tie.

Mateen also seemed to keep his options open with women too, according to a female user of dating site Plenty Of Fish.

The gunman who attacked a Florida LGBT nightclub had attended the club before the attack and had used a gay dating and chat app, witnesses said.

Kevin West, a regular at Pulse nightclub, said Omar Mateen messaged him on and off for a year before the shooting using the gay chat and dating app Jack’d. West was dropping off a friend at the club when he noticed Mateen – whom he knew by sight but not by name – crossing the street wearing a dark cap and carrying a black cellphone about 1 a.m., an hour before the shooting.

Orlando terror attack updates: Obama meets with victims' families in Orlando June 16, 2016, p.m.

Forty-nine people are dead and at least 53 injured in the deadliest shooting in American history after Omar Mateen, a 29-year-old U. citizen, opened fire and took hostages inside the Pulse gay...

At least four regular customers of Pulse, the lesbian, gay, bisexual and transgender nightclub where the massacre took place, told the Orlando Sentinel on Monday that they believed they had seen Mateen there before."Sometimes he would go over in the corner and sit and drink by himself, and other times he would get so drunk he was loud and belligerent," said Ty Smith, who also uses the name Aries.