They hear gunshots and explosions and call other agencies for help. Bombs continue to explode.
Some students log onto the Internet, seeking help.
The dead include two suspects whose bodies are booby-trapped with explosive devices. More explosive devices found in the school's west parking lot. Hourly press conferences begin. Some parents begin receiving word of their childrens' deaths. Another bomb, triggered by a timing device, explodes as SWAT team officers comb the school.