Mateen identified himself as a 'Mujahideen', 'Islamic Soldier' and 'Soldier of God' in a phone call to 911 during the shooting, and swore allegiance to the then leader of ISIS Abu Bakr al-Baghdadi. Instead, the FBI's theory focuses on a series of Facebook posts Mateen made from different accounts just hours before the shooting, vowing to take vengeance on America for airstrikes in Iraq and Syria. The FBI says it doesn't believe that Mateen was homosexual (Image: Los Angeles Times via Getty Images)
