SYDNEY (AP) — A teenager has been accused of wounding a Christian bishop and priest during a church service in a second high-profile knife attack to rock Sydney in recent days that authorities on Tuesday declared an act of terrorism.

The 16-year-old was overpowered by the shocked congregation at Christ the Good Shepherd Church after he allegedly stabbed Bishop Mar Mari Emmanuel and Fr. Isaac Royel during a service on Monday night that was being streamed online.

Police have not commented on reports that the boy’s fingers were severed by parishioners in the Orthodox Assyrian church in suburban Wakeley, but confirmed his hand injuries were “severe.”

Video of the attack spread quickly on social media and an angry mob converged on the church demanding vengeance. They hurled bricks and bottles at police, who temporarily barricaded the boy inside the church for his own safety.