An aerial view shows students and police officers crouched behind a car outside Columbine High School in Littleton Co., on Tuesday, April 20,1999. The body of an unidentified person appears at upper center on sidewalk. Two young men in fatigues and black trench coats opened fire at the suburban Denver high school Tuesday in what police called a suicide mission, and the sheriff said 25 people may have been killed. (AP Photo/Rocky Mountain News, Rodolfo Gonzalez) MANDATORY CREDIT-- MAGS OUT--TV OUT--ONLINE OUT--DENVER OUT.