According to investigators, Harris and Klebold commit suicide. Early afternoon 615 officers from 27 agencies converge on the school. Anguished parents, awaiting word on their children, gather at nearby Leawood Elementary School. 4 p.m. The sheriff's spokesman confirms that as many as 25 people are dead. Officers find the bodies of both suspects.
SWAT teams declare the school safe.
Authorities find an explosive device in a car in the school parking lot. The sheriff's spokesman says entire school is regarded as a massive crime scene. The campus is marked off with yards of yellow tape. All bodies are still inside. Bomb technicians, accompanied by electricians, clear a path to the administration area to cut power to the alarm system.