>> William Clyde Allen the third was arrested at his home in Logan, Utah on Wednesday. He's suspected of mailing suspicious letters to the President and the Pentagon, that officials initially feared contain the poison ricin. FBI agents searched his house and warned neighbors to stay away as they look for other potentially hazardous chemicals inside.
The letters sent to the Pentagon were addressed to defense secretary James Mattis and chief of naval operations, John Richardson. They were intercepted at a mail sorting facility after setting off an alarm for ricin. Authorities say further tests showed the letter contain castor seeds from which ricin is derived.
The letter sent to the White House, addressed to President Trump was also intercepted. Ricin is naturally found in castor seeds but it takes a deliberate act to convert it. Allen served in the U.S. Navy from 1998 to 2002. He's expected to be formally charged on Friday.