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.

"They were sitting in the pews at Mass when they were shot and killed," Minneapolis Police Chief Brian O'Hara said.

The injured include 14 children between the ages of 6 and 15 and three adults in their 80s. At least eight of the injured children, as well as two of the injured adults, were being treated at the nearby Hennepin Healthcare trauma hospital Wednesday.

Officials said those injured are expected to recover.

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

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