The Defense Intelligence Agency announced that “no suspicious packages or letters,” were found after the agency’s mail screening equipment Tuesday alerted them to a potentially harmful substance.
Army Lt. Col. Thomas Veale said the FBI was called in to take some samples for “further testing off site.”
The DIA is located at Joint Base Anacostia-Bolling in Southeast Washington.
Last week, three letters tainted with ricin were sent to President Obama, Sen. Roger Wicker, R-Miss., and a judge. Police have released the lone suspect in the case, a Corinth, Mississippi man who is an Elvis impersonator, for lack of evidence tying him to the letters.