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The guns: The shooter purchased a handgun and a long gun within the last few days, Trevor Velinor Bureau of Alcohol, Tobacco, Firearms and Explosives told reporters.
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The classmates said that the September 11 attacks seemed to be a significant moment for him and recounted how his mental health may have been affected. High school classmates remember odd statement: Two former high school classmates remember Mateen saying something to the effect Osama bin Laden was his uncle, which caused a lot of brushback from other students. The imam appealed for peace saying: "We have to stop the killing and bloodshed." Rahman said Mateen had been coming to the mosque since 2003. Rahman said he was at Friday prayers - his usual routine. He would come to the mosque two or three times a week for two hours and talk to no one. Local mosque reaction: The imam at the Fort Pierce Islamic Center, Syed Shafeeq Rahman, said Mateen was playful and more social when young but had recently kept to himself. No claim of responsibility: There has been no claim of responsibility for the Orlando nightclub terror attack on jihadi forums, but ISIS sympathizers reacted by praising the attack on pro-Islamic State forums, according to CNN terrorism analyst Paul Cruickshank. But the knowledge about his possible sympathies explains why they are treating the case as likely Islamic-related terror. Investigators haven't found evidence to show he was acting on behalf of ISIS. There was no indication he was plotting to carry out an attack, the officials said. Suspected ISIS sympathizer: Law enforcement officials say Mateen was known to the FBI, one of hundreds of people suspected of being ISIS sympathizers who are on the FBI's radar, according to two law enforcement officials. He was not considered a priority subject. The next year, Mateen was interviewed over possible connections to an American suicide bomber. Mateen was the subject of the 2013 investigation after making comments to co-workers about terrorist ties. "Those interviews turned out to be inconclusive, so there was nothing to keep the investigation going." He was not under investigation at the time of Sunday's shooting and was not under surveillance, Hopper said. FBI investigation: The FBI interviewed the shooter in 20, FBI Assistant Special Agent in Charge Ronald Hopper said.