BOSTON (AP) — An Oklahoma man was arrested Wednesday after authorities accused him of throwing a pipe bomb at the Massachusetts headquarters of a group called The Satanic Temple.

The Salem-based group says on its website that it campaigns for secularism and individual liberties, and that its members don’t actually worship Satan.

Sean Patrick Palmer, 49, of Perkins, Oklahoma, has been charged with using an explosive to damage a building following an attack last week on the headquarters, which is also used as an art gallery.

Several phone numbers associated with Palmer were out of service Wednesday, and the U.S. Attorney’s Office in Massachusetts said they didn’t yet have the name of any lawyer representing him. He is due to make an initial court appearance in Oklahoma on Thursday. If found guilty, he could face up to 20 years in prison and a fine of up to $250,000.