Documents: Pulse gunman repeatedly taunted, harassed for being Muslim

ORLANDO, Fla. -- New documents show the gunman who killed 49 patrons at a Florida nightclub was repeatedly taunted for being Muslim in his job as a security guard at a Florida courthouse.

Records released Monday by the St. Lucie County Sheriff's Office show Omar Mateen claimed he was regularly called derogatory epithets for being Muslim by deputies and others at the St. Lucie Courthouse, where he worked as a contract guard.

PHOTOS: Mass casualties in Orlando nightclub shooting

Also according to the records, Mateen told his bosses that in response to the taunting, he told co-workers he had ties to the Boston Marathon bombing suspects and the Fort Hood shooter.

That prompted an investigation by the FBI, which concluded he wasn't a terrorist.

Mateen opened fire at the Pulse nightclub in Orlando on June 12, leaving 49 dead and 53 wounded. He was eventually killed by police.

WATCH VIDEO: These are the victims of the Pulse Nightclub shooting in Orlando

Click here for full coverage on the Orlando Shooting