Shooting begins 11:19 A.M.
Harris and Klebold walked toward the school after realizing the bombs they placed in the cafeteria failed to explode. At this point, both were armed. They climbed to the top of the outdoor West Entrance steps, placing them directly above the cafeteria. At 11:19 A.M., witness heard Eric Harris yell "Go! Go!" The two gunmen pulled their guns from beneath their trench coats and began shooting. At that point, Rachel Scott was hit four times and killed instantly. Richard Castaldo was shot eight times in the chest, arm and abdomen. He became paralyzed below the chest.
Police response 11:22 a.m.
At 11:22, the custodian called Deputy Neil Gardner requesting assistance in the senior parking lot. Five minutes after the shooting started, and two minutes after the first call, Gardner was engaged in a gun fight with the student shooters. By this time there were already two dead and ten wounded.
Suicide of perpetrators
At approximately 12:08 P.M., Patti Nielson overheard Harris and Klebold shout in unison then a sound of gunfire. Both had committed suicide.
The crisis ends
By 12:10 P.M., SWAT teams were stationed outside the school. Ambulances started taking care of the wounded. Authorities and SWAT teams entered the school at 1:09 p.m., moving from classroom to classroom discovering hidden faculty and students.
This massacre will change America’s schools around the country. As security improves, schools may be built in pods to help prevent things like this.