Minneapolis attacker talked of depression and left behind list of grievances

People visit a make-shift memorial at Annunciation Catholic Church in Minneapolis (Abbie Parr/AP)

The person who killed two Catholic school students and wounded more than a dozen children sitting in the pews of a Minneapolis church once attended the school and had been a member of the church, the city’s police chief said.

Authorities were poring over videos, writings and movements of the attacker but remained uncertain what motivated 23-year-old Robin Westman to open fire through stained glass windows as children celebrated Mass on the first week of classes at the Annunciation Catholic School.