Australian police have declared stabbings that took place on April 15 at an Assyrian church in Sydney a "terrorist incident" motivated by suspected religious extremism.

At least four people were wounded in the attack, and the 15-year-old boy who stabbed a bishop and a priest was arrested. Australians are still in shock after a lone assailant stabbed six people to death in a busy Sydney shopping mall on April 13 and injured more than a dozen others.