Mateen's Facebook post: 'I pledge my alliance' to ISIS chief

Omar Mateen

Omar Mateen, the radicalized Muslim who shot and killd 49 in an Orlando "gay" bar, and injured another 53, posted his hatred of America and his allegiance to an ISIS leader in a message on his personal Facebook page in the lead-up to his massacre, and also vowed more attacks were coming.

The posts were made the day of the Orlando attacks, the Washington Post reported.

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According to a letter from Sen. Ron Johnson, chairman of the Senate Homeland Security Committee, Mateen wrote this: "America and Russia stop bombing the Islamic state..I pledge my alliance to [ISIS leader] abu bakr al Baghdadi ..may Allah accept me."

Johnson, who posted his letter detailing Mateen's messaging on his own Facebook page, said the terrorist also wrote this: "The real muslims will never accept the filthy ways of the west ... You kill innocent women and children by doing us airstrikes..now taste the Islamic state vengeance."

Mateen on Sunday also searched on Facebook for "Pulse Orlando," the name of the nightclub he ultimately attacked, the Washington Post reported.

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Johnson's letter underscores the radical Islamist connection many in the intelligence, security and political worlds were making after it was learned Mateen, during the actual shootings, called 9-1-1 and pledged allegiance to the ISIS leader. President Obama has staunchly refused to call the attack an act of radical Islamic terror, saying instead such characterizations are unnecessary and that he's already labeled the massacre a terrorist incident.

Johnson's letter also comes just after James Comey, the director of the FBI, said no signs existed showing Mateen was connected to any kind of terrorist network, and it was unclear which group he supported, the Washington Post reported. As Comey said, investigators talking to Mateen's former co-workers have discovered he told them his family was tied to al-Qaida and that he was a member of Hezbollah.

The Washington Post also learned Mateen had previously smoked marijuana, taken steroids and been expelled from high school in the ninth grade for fighting. Following, he was convicted of some sort of unspecified crime, served on probation and then had his record sealed or expunged.