Mosque where Florida nightclub shooter worshiped set on fire

Emergency personnel are seen at the Islamic Center of Fort Pierce which was set on fire, in Fort Pierce, Florida, September 12, 2016. St. Lucie County Sheriff's Office/Handout via Reuters

(Reuters) - The Florida mosque where Omar Mateen, who committed the deadliest mass shooting in U.S. history, prayed was badly damaged on Monday in an arson attack, investigators said.

Mateen was killed by law enforcement officials after killing 49 people and wounding 53 others in a gay nightclub in Orlando in June.