A gunman killed two young children and injured 17 people gathered at Annunciation Catholic Church in Minneapolis for a service on Wednesday to mark the first week of the parish's school, police said.

Fourteen of the injured are children, two of whom are in critical condition, Minneapolis Police Chief Brian O'Hara said at a news conference.

The children who died were 8 and 10 years old, O'Hara said.

The shooter, who officials later identified as Robin Westman, is dead from an apparently self-inflicted gunshot wound, he said.

Westman left behind multiple online videos referencing violent thoughts and suicide, as well as a sketch of a church's interior and an apology to their family, senior law enforcement officials briefed on the matter told NBC News.

The attack occurred just before 8:3

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