On the morning of 5 March 2001, Andy Williams, who had just turned 15, took his father’s long-barrelled .22-calibre revolver and 40 bullets to his high school in Santee, California, in his backpack. Opening fire in the school toilets and then in the school quad, he shot dead Bryan Zuckor, 14, and Randy Gordon, 17, and wounded 13 others, 11 of...

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