Packages with suspicious substances — at least two of which initially tested positive for ricin — sent to the Pentagon, White House and Sen. Ted Cruz’s office in Texas this week were part of a coordinated effort by a former Navy sailor, officials told Fox News.
William Clyde Allen III was arrested in Logan, Utah on a probable cause warrant, but charges were not likely until Friday, the source said.
Allen served in the U.S. Navy from 1998 to 2002 as a Damage Control Fireman Apprentice, per Navy records.
Officials say they received a tip which led them to Allen.
A Federal Bureau of Investigation statement in Salt Lake City said the agency was investigating “potentially hazardous chemicals” in Logan, which is about 66 miles (106 km) north of Salt Lake City.
A Pentagon spokeswoman said tests showed that Tuesday’s alert was triggered by castor seeds, which ricin is derived from, as opposed to the deadly substance itself.
The Hill reported Tuesday the U.S. Secret Service said it intercepted a suspicious envelope addressed to President Trump a day earlier, one of three reported instances of suspicious mail being sent to government-related offices in recent days.
The Secret Service confirmed to The Hill that the suspicious envelope was not received at the White House, nor did it enter the building.
The packages sent to the Pentagon, were addressed to Secretary of Defense James Mattis and to Chief of Naval Operations, Admiral John Richardson, a defense official tells CNN.
According to a report from Fox News, the packages did not make it directly to the Pentagon but were received and flagged by an onsite mail delivery building.