An envelope thought to contain ricin was sent to the Capitol Hill office of Sen. Roger Wicker, lawmakers told Fox News on Tuesday.
The letter to the Mississippi Republican was intercepted at an off-site mail screening facility and never reached the Hill.
Authorities declined to comment on a suspect or any other aspect of the investigation being led by Capitol Police, but Sen. Claire McCaskill, D-Mo., told the Associated Press police have a suspect in mind.
“The person that is a suspect writes a lot of letters to members,” McCaskill said as she emerged from a classified briefing.
Testing is apparently still underway. The letter tested positive for ricin in a field test, but the FBI released a statement Wednesday saying tests have shown “inconsistent results” and the substance is being further analyzed.
According to a Homeland Security Department handbook, ricin is deadliest when inhaled. It is not contagious, but there is no antidote.
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