Two children, ages 8 and 10, were killed and 17 others injured Wednesday when a gunman opened fire during an all-school Mass at Annunciation Catholic School in Minneapolis, police said.

Fourteen people are being treated for injuries, including two children in critical condition.

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Hennepin Healthcare confirmed it is treating 11 patients. Meanwhile, Children's Minnesota said it's treating six children.

Authorities said the gunman shot dozens of rounds from outside the church, targeting children and worshipers.

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

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