America grapples with 'ghost guns' amid epidemic of violence

After his mother dropped him off at school, Nathan Berhow pulled a .45-caliber pistol out of his backpack, opened fire and killed two classmates, all using a weapon he'd assembled at home. Such guns are sometimes called "ghost guns" -- unregulated, easy to put together and almost impossible to trace because they have no serial number. The parts are readily available online, with no need for a background check.

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