Weapons used in the Columbine High School shootings http://www.boulderdailycamera.com/shooting/423weapon.html
One TEC DC 9, modified, semi-automatic pistol
One sawed-off double-barrel shotgun
One sawed-off pump-action shotgun
One 9 mm semi-automatic rifle
More than 30 homemade explosives, including pipe bombs, crude hand grenades and a propane tank with explosives attached.
The propane tank bomb was set up with an egg timer and a gasoline can and had matches tied to a fuse from a model rocket. Explosives expert Sid Woodcock said such a bomb "probably would have destroyed a good part of the school."
Some of the pipe bombs were filled with nails to maximize their killing power. Published reports said broken glass also was used. April 23, 1999