FORT PIERCE, Fla. —Authorities in St. Lucie County have arrested a man they say set fire to the Fort Pierce Mosque that was occasionally attended by the Pulse nightclub gunman.

Joseph Schreiber was arrested Wednesday in Fort Pierce, the St. Lucie County Sheriff's Office said.

The fire was started late Sunday and burned for over five hours before it was extinguished early Monday. The fire was started on the 15th anniversary of the 9/11 terrorist attacks and the start of the Muslim holiday Eid al-Adha.

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

Assistant Imam Hamaad Rahman, of the Islamic Center of Fort Pierce, said the community is bigger and stronger than a building, and the attack will bring it together. He said the mosque has received more threats since June's nightclub shooting than it did in its previous 20 years of existence.

In a statement reacting to the arrest, CAIR-Florida Communications Director Wilfredo A. Ruiz said:

"We appreciate the high level of communication and collaboration of the St. Lucie Sheriff's Office and the U.S. Department of Justice, specifically the U.S. Attorney's Office for the Southern District of Florida, with CAIR-Florida and the Muslim community. This high level of involvement in the midst of the worst attack on an Islamic center in the history of Florida is welcomed. Today's arrest is a step in the right direction. We will monitor this case to ensure that the alleged perpetrator is prosecuted to the full extent of the law."