Authorities say they have found two additional letters a Navy veteran in Utah sent to staff of President Donald Trump’s administration containing a substance from which the poison ricin is derived.
An indictment unsealed Thursday says 39-year-old William Clyde Allen III mailed envelopes to the CIA director, Air Force secretary Heather Wilson, as well as Trump, Defense Secretary James Mattis and Chief of Naval Operations Admiral John Richardson.
Allen pleaded not guilty to seven charges, including threatening to use a biological toxin as a weapon.
Federal prosecutors say the two letters containing ground castor beans were intercepted after authorities found envelopes mailed to Trump, the FBI director, secretary of defense and the Navy’s top officer. They say Allen’s return address was on them.
Charging documents say he said he wanted to “send a message,” but did not elaborate on his motivations.