Charging documents filed Friday in U.S. District Court say 39-year-old William Clyde Allen III told investigators he wanted to "send a message."
William Clyde Allen III confessed to investigators after his arrest.
The former enlisted sailor who spent four years in the Navy is expected to be formally charged Friday.
Police and FBI are at the home of the Logan, Utah, suspect, but no arrests have been made.
By Tara Copp, AP
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