Gunman signaled attack in Facebook post
Omar Mateen published a Facebook post just before the Orlando attack.
A source familiar with the investigation tells CBS News gunmanOmar Mateen referenced the Islamic State of Iraq and Syria (ISIS) in a Facebook message posted moments before the Orlando nightclub shooting.
“You kill innocent women and children by doing us airstrikes..now taste the Islamic state vengeance [sic],” Mateen wrote, according to the source.
“In the next few days you will see attacks from the Islamic State [ISIS] in the usa,” the post said.