>> We know enough to say that this was an act of terror and an act of hate.>> Omar Mateen killed 50 people in the deadliest mass shooting in US history. Now authorities are digging into his life and contacts. The FBI confirming Sunday they'd been aware of Mateen since 2013, and had even investigated possible Jihadist connections but didn't find anything worth pursuing.
>> He made inflammatory comments to co-workers, alleging possible terrorist ties. In the course of the investigation Mateen, was interviewed twice. Ultimately we were unable to verify the substance of his comments, and the investigation was closed.>> An unconfirmed report says he called 911 before the shooting and pledged allegiance to Islamic State.
ISIS has taken responsibility for the attack through their news agency, but David Morgan says that for now, none of this is confirmed.>> According to US Officials, there is no direct evidence yet of any definitive link with ISIS, or any other extremist group. It's worth pointing out that ISIS leadership has been urging these kinds of attacks, during the holy month of Ramadan, which began on June the 5th.
>> We are still learning all the facts.>> Mateen, who is a US citizen from Fort Pierce, Florida about 120 miles south of Orlando.>> He did purchase two firearms, a handgun and a long gun within the last few days.>> He was born in New York to parents from Afghanistan and worked as a security guard.
Mateen opened fire at the Pulse nightclub early Sunday morning with an AR-15 rifle, and was killed by police after a three hour hostage situation.