The Latest: Columbine moves ahead with memorial events

The Latest on the investigation of a woman believed to have posed a threat to schools in Colorado (all times local): 9:40 p.m. Columbine High School is moving ahead with ceremonies marking the 20th anniversary of an attack that killed 13 people, and the community is awaiting more details on what led a teenager allegedly obsessed with the 1999 shooting to buy a shotgun and kill herself in the snowy foothills nearby.