A man has been arrested and is facing a charge of arson and hate crime over a fire that heavily damaged a mosque that Orlando nightclub gunman Omar Mateen attended.

Joseph Schreiber, 32, was arrested without incident in Florida on Wednesday afternoon and was being interrogated by investigators looking into the fire set late on Sunday at the Islamic Centre of Fort Pierce.

Major David Thompson of the St Lucie County Sheriff's Office said Schreiber was held on a street in Fort Pierce by authorities acting on tips from members of the community and aided by surveillance video taken from the mosque and elsewhere.

He said the arson charge, coupled with a hate crime enhancement under Florida law, carries a sentence of up to 30 years in prison.

The fire was set on Sunday on the 15th anniversary of the 9/11 terror attacks. The blaze also coincided with the Muslim holiday Eid al-Adha.

Mr Thompson said a search warrant was executed at Schreiber's home, where investigators reported finding evidence linked to the arson, as well as anti-Islamic social media posts.

Schreiber was previously sentenced twice to state prison for theft, according to records from the Florida Department of Corrections. He served his first sentence from March 2008 to July 2009 and his second from June 2010 to August 2014.

No-one was injured in the fire, which burned a 10-by-10-ft hole in the roof at the back of the mosque's main building and blackened its eaves with soot.

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. He professed allegiance to the Islamic State group. His father is among roughly 100 people who attend the mosque.

A weekend surveillance video from the mosque showed a man on a motorcycle approaching the building with a bottle of liquid and some papers, then leaving when there was a flash and shaking his hand as though he may have burned it, Mr Thompson said.

The first 911 calls were made about 45 minutes later after the fire had spread to the attic. It took more than four hours for firefighters to extinguish the blaze.

No-one had claimed responsibility for the attack, authorities said.

The FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives joined the investigation into the fire. Sheriff's officials had released the video and asked for the public's help in identifying the arsonist.

Wilfredo Amr Ruiz, a spokesman for the Council on American-Islamic Relations Florida, responded to social media posts by Schreiber claiming to be a Jew who was fighting back.

"He obviously doesn't know about the efforts our community is engaged in with our cousins, the Jews, not only in Florida but throughout the nation," Mr Ruiz said.

Omar Saleh, a lawyer for CAIR, described both Schreiber and Mateen as "degenerates" and "punks".

Mr Saleh said: "Just like on June 12, when I was stressing that Mateen's actions do not speak on behalf of Islam, I know that whatever religion Mr Schreiber is, his actions do not speak on behalf of his religion."

The fire was part of an escalating series of threats and violence perpetuated against the mosque and its members, said Mr Ruiz.

He said the mosque began receiving threatening phone calls shortly after the Pulse massacre, and in July a member was punched in the face as he arrived for morning prayers.

Sunday's fire has left the mosque's members "saddened and scared," said assistant imam Hamaad Rahman.

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