Australian police have declared Monday’s stabbing at a Sydney church a religiously motivated “terrorist act”.

A 16-year-old boy was arrested after a bishop, a priest and churchgoers were attacked during mass at the Assyrian Christ The Good Shepherd Church.

At least four people suffered “non-life-threatening” injuries, police say. The attacker was also hurt.

The incident was captured on a church livestream and quickly triggered unrest in the suburb of Wakeley.