|Updated: 4/17 12:22 pm
||Published: 4/17 10:08 am
WASHINGTON (AP) - A senator says police have a suspect in mind as they try to determine who mailed a letter that tested positive for poisonous ricin to one of her colleagues, Sen. Roger Wicker of Mississippi.
Missouri Sen. Claire McCaskill says the suspect writes a lot of letters to lawmakers.
Authorities declined to comment Tuesday on a suspect or any other aspect of the investigation being led by Capitol Police and the FBI after tests indicated that a letter mailed to Wicker's Washington office contained the potentially deadly toxin.
The letter was intercepted at a Senate mail facility. Its discovery shook the U.S. Capitol, where several events had been canceled in response to Monday's deadly bombings at the Boston Marathon. There was no evidence of a connection between the two events.
Authorities are investigating two suspicious letters that were sent to the Phoenix office of U.S. Sen. Jeff Flake of Arizona.
Emergency crews in hazardous materials gear were seen outside the building.
U.S. Sen. John McCain has an office directly across the street, and a spokesman for him said authorities have told staff not to open any packages as authorities investigate.
Flake is a Republican who was elected to the Senate last year.
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