New Delhi, Aug. 28 -- Police are examining a disturbing series of videos posted online by the suspected gunman in Wednesday's Catholic school shooting, which left two children dead and 17 others wounded. Authorities say the clips, which they are treating as a "manifesto," provide new insights into the attacker's mindset and preparation.

Minneapolis police chief Brian O'Hara identified the assailant as Robin Westman, 23, who opened fire through the stained-glass windows of Annunciation Catholic School's church at around 8:30 a.m., as pupils gathered for Mass to mark the start of the academic year.

Two children, aged eight and ten, were killed while seated in the pews. Fourteen other children and three parishioners in their 80s were injur...