
Defense Department personnel wearing protective suits screen mail as it arrives at the Pentagon
Envelopes addressed to Defense Secretary James Mattis and Chief of Naval Operations Admiral John Richardson tested positive for ricin contamination at the Pentagon mailroom on Monday. The Secret Service said on Tuesday that another suspicious letter was addressed to President Donald Trump, though they did not initially say it contained ricin.
The suspect was identified as William Clyde Allen III, Reuters reported citing federal law enforcement. It was earlier reported he's a US Navy veteran.














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