New Delhi, Aug. 28 -- A deadly shooting took place at the Annunciation Church's Catholic school in Minneapolis, located in the US state of Minnesota, on Wednesday (local time) as students prayed during their first week back to school.

A heavily-armed shooter opened fire on August 27 on school children attending a church service in Minneapolis.

City police chief Brian O'Hara said that the attacker sprayed bullets through the windows of the Annunciation Church as dozens of young students were at a Mass marking their first week back at school, news agency AFP reported.

Who was the shooter? What was the motive behind the shooting? Were there any casualties? Here's all you need to know:

Two pupils were killed, and 17 people were injured in...