Pittsburgh Police from Zone 4 responded to St. John's Catholic Church at 506 Saline Street just after 11:15 a.m. for a threat made over the phone.
A male called 9-1-1 and indicated he was going to harm congregants and himself, and that he had multiple firearms.
Officers arrived at the church and cleared the interior of any threats. They then established a perimeter and worked to move the 30 congregants out in small groups under police escort.
At approximately 12 p.m. everyone in the church had safely exited and the building was secured.
The investigation is ongoing.