An Oklahoma man has been arrested after authorities accused him of throwing a pipe bomb at the headquarters of a group in Salem, Massachusetts, called The Satanic Temple.

Surveillance cameras showed a man walk up to the building soon after 4 a.m. on April 8 wearing a face covering, tactical vest and gloves, according to the U.S. Attorney’s Office and the FBI. The man then ignited an improvised explosive device, threw it at the main entrance then ran away. The bomb partially detonated, resulting in some minor fire damage, authorities said.