UNLV gunman sent letters to university personnel across the country before shootings, sheriff says
By John Miller, Elizabeth Wolfe, Taylor Romine, Evan Perez, Andy Rose and Cheri Mossburg, CNN (CNN) — Anthony Polito, the gunman authorities said killed three people Wednesday at the University of Nevada, Las Vegas, visited a post office in Henderson and mailed 22 letters to various university personnel across the country with no return address,
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