Mateen was killed by police after opening fire at the Pulse nightclub on June 12 in a rampage that left 49 victims dead and 53 wounded, making it the worst mass shooting in modern US history.
The St. Lucie County Sheriff's Office said that Joseph Schreiber, 32, of Port St. Lucie, was arrested in Fort Pierce. No one was hurt in the fire, but it did burn a 10 ft.by 10 ft. hole in the roof of the mosque.
He was arrested without incident on Wednesday while walking along a footpath in Fort Pierce, Thompson said. Mateen, who killed 49 people at the Orlando nightclub in June, had attended the mosque.
News 6 found out Schreiber has been in and out of prison, serving a combined 6 1/2 years for theft.
The sheriff's office shared a video Monday that showed a "lone individual either of white or Hispanic ancestry" disembark from a "Harley Davidson-style motorcycle" and enter the mosque complex made up of several buildings, some of them wooden, just before midnight.
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A suspect was arrested Wednesday on arson-related charges involving an Islamic complex in Florida, officials said.
Investigations into Schreiber's social media use showed he had posted anti-Muslim rhetoric to his Facebook page, references to the September 11 terrorist attacks, and showed he supported the state of Israel. Schreiber was convicted and incarcerated from June 2010 to August 2014, according to prison records.
The major said tips from callers and surveillance video led to the arrest.
"There is anti-Islam propaganda, and that corroborates our fear that it has to do with the Islamic community", said Maj. The first 911 calls were made about 45 minutes later after the fire had spread to the attic. It took about 4 1/2 hours for firefighters to extinguish the blaze. There was security footage of the attack showing a man setting fire at the mosque before fleeing on his motorcycle. While nobody was injured, the fire did cause considerable damage to the center.
Speaking after the fire on Monday, Ibrahim Hooper, the national spokesman for the Council on American-Islamic Relations said, "Unfortunately, within the past year, we've seen an unprecedented rise in bigotry in our society".