In an update on its official Facebook page, The St Lucie County Sheriff's Office said surveillance video shows someone approaching the Islamic Center of Fort Pierce around 12:30 am today, moments before a flash was seen and the fire started.
Firefighters extinguished the fire and there was no word about how much damage the fire caused.
No injuries have been reported.
The mosque was attended by Omar Mateen, who opened fire at the Pulse nightclub on June 12 in a rampage that left 49 victims dead and 53 wounded. It was the worst mass shooting in modern US history.
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It's not the first time the mosque has seen trouble since the Orlando attack.
A few weeks after the nightclub shooting, a man was beaten outside the mosque, according to Sheriff Ken J Mascara.
The man was stopped by deputies and arrested a short time later.
The Council on American-Islamic Relations said in a statement that a man in a truck had stopped outside the mosque earlier that day and made slurs, including, "you Muslims need to get back to your country."
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