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Cleveland faced propane bombs in the cafeteria filled with 500 students. expert say had the tanks exploded as planned they would have killed nearly everyone inside. the propane bombs were two of 76 devices eventually found on and around the campus. an additional 13 explosives were found in the killers cars and 8 more at their homes for a total of 99. videotapes were later found of harris and klebold full of cartridge bonds they called crickets and grenades. and a series of time clocks aimed at setting up a progression of explosions. investigators say the teens resorted to guns after they ran o...

Went off, either before or after the shooting started so the students scrambled to get out of the school. once people realized what was happening, teachers and staff began yelling to run. we know that out of the at least eight who died, it's unclear how many are students. how many are adults. teachers, if there are any police officers involved. we just know it's a devastating loss. >> it is. the thing is we talk about this. the explosive devices placed as the sheriff says both on the campus and off the campus. it takes us back to columbine because in the days of columbine, that was supposed to...

Than certainly circumstances. >> reporter: at the mall police found propane tanks at a pipe bomb. kind of weaponry used by dylan klebold and eric harris in their assault. >> very similar. in columbine, most people don't realize it was intended primarily as a bombing with shooting involved. there were several large propane bombs involved. they also had about 100 pipe bombs. >> reporter: investigators have released surveillance camera images of a man seen in the mall just minutes before a fire was discovered. that may have been part of an attempt to detonate the explosives. authorities want to f...

Right now i think what the federal government has to do is try to collaborate with the troops on the ground and that is the new york police department. >> i don't know if you are aware in the last few minutes there has been another incident in pittsburgh. they were doing a full marathon today and some where near the finish line police found another explosive device. it was inside a microwave oven. it was disconnected, made not a threat but i guess nye question is if you are the secondary of homeland security and you had an incident in times square and then the next day you have an incident in ...