At least 20 others were injured during the tragedy that occurred during morning Mass.
Three people were killed and 20 injured in a shooting at a Catholic school in the south end of Minneapolis on Wednesday, a US Justice Department official said.
The shooter was among those killed, said the official, who spoke on condition of anonymity.
The shooting occurred two days after school started at Annunciation Catholic school, a private junior school with about 395 students.
