Three people are dead, including the gunman, after a shooting was reported at Minnesota’s Annunciation Church on Wednesday morning.

Minneapolis Police Chief Brian O’Hara said the gunman began opening fire shortly before 8:30 a.m. local time as dozens of students were gathered for an all-school Mass. Two children were killed, aged 8 and 10, and another 17 people were injured, 14 of them children. Two of the injured children were in critical condition.