'There is no message': The search for ideological motives in the Minneapolis shooting

A memorial to shooting victims sits in front of Annunciation Catholic Church on Aug. 28 in Minneapolis. A gunman fired through the windows of the church while students were sitting in pews during a Catholic school Mass. The gunman reportedly died at the scene from a self-inflicted gunshot wound, according to police.

The FBI is calling the attack at a Minnesota Catholic church an act of domestic terrorism driven by "hate-filled ideology." Extremism analysts say the picture may be more complex.

(Image credit: Scott Olson)