MINNEAPOLIS — Two children were killed and 17 other people were wounded on Wednesday at a Minneapolis Catholic school when a shooter dressed in black opened fire on students attending Mass on the third day of school, authorities said.

The assailant fired through the windows at students sitting in pews and entering the church and then killed himself, officials said. Two students, 8 years old and 10 years old, were pronounced dead at the scene, they said.

“This was a deliberate act of violence against innocent children and other people worshiping. The sheer cruelty and cowardice of firing into a church full of children is absolutely incomprehensible,” Minneapolis Police Chief Brian O’Hara told reporters.

The shooting was one of the first signs that the epidemic of gun violence at U.S. sch

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