An explosive device was chucked onto the front porch of the Satanic Temple in Salem, Mass., earning the ire of the city’s mayor, who dubbed it a “terrorist attack.”

Nobody was inside the house of worship when the device landed outside the front door Monday morning around 4:15 a.m., Salem police said in a news release. And while the device failed to fully detonate, a part of the building was left burnt by the partial blast.

Lucien Greaves, a spokesperson and co-founder of the Satanic Temple, told the Boston Globe the device had “fizzled out, scorching some of the front of the house.”

Temple staffers did not notice the damage until they arrived late afternoon the same day. State police bomb technicians were called to the scene to…