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On Friday, state and federal authorities charged the woman who bought the guns used when William Spengler ambush firefighters lured to a blaze he set at his house in upstate Webster. Dawn Nguyen, 24, was charged with lying on a form that said she would be the owner of the guns she bought for Spengler. The charges involve the semiautomatic rifle and the 12-gauge shotgun that Spengler had with him Monday when volunteer firefighters Michael Chiapperini and Tomasz Kaczowka were gunned down. Three other people, including two other firefighters, were wounded before the 62-year-old Spengler killed himself.