The gunman, who died in a confrontation with police, was a 67-year-old career college professor whose online profile paints a picture of a man fascinated by Vegas, puzzles and conspiracy theories. Further details about the letters’ contents weren’t immediately released.ĭetectives are continuing to process the envelopes and are asking “anyone in the education world” who receives a letter with no return address to “proceed with caution,” McMahill said. McMahill indicated they were working to contact the recipients.Īt least some of the envelopes had a white powder in them, but the substance was found to be harmless, Las Vegas police said Thursday evening. Investigators are working with the postal inspector and federal partners to process the letters, McMahill said at a Thursday news conference. 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, according to Las Vegas Sheriff Kevin McMahill.
