FORT PIERCE, Fla.—About two months before Joseph Michael Schreiber allegedly tried to burn down a mosque sometimes attended by Orlando nightclub shooter Omar Mateen, he posted on Facebook that “All Islam is radical” and that all Muslims should be treated as terrorists and criminals.
Schreiber, 32, was arrested without incident Wednesday afternoon and was being interrogated by investigators looking into the fire set late Sunday at the Islamic Center of Fort Pierce, said Maj. David Thompson of the St. Lucie County Sheriff’s Office.

Joseph Michael Schreiber. St. Lucie County Sheriff's Office via AP