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In the months prior to the attacks, Harris and Klebold acquired two 9 mm firearms and two 12-gauge shotguns. A rifle and the two shotguns were bought in a straw purchase in December 1998 by a friend, Robyn Anderson.[10] Harris and Klebold later bought a handgun from a friend, Mark Manes. Manes was jailed after the massacre for the offense of selling a handgun to a minor,[11] as was Philip Duran, who had introduced the duo to Manes.[12]

With instructions from the Internet, such as The Anarchist Cookbook, they also built 99 improvised explosive devices of various designs and sizes. They also sawed the barrels and butts off their shotguns in order to make them easier to conceal. The two perpetrators committed numerous felony violations of state and federal law, including the National Firearms Act and the Gun Control Act of 1968, even before the massacre began.

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And please don't remind me of Columbine High school.

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