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A heavily armed United States Marshall stands guard outside the Moakley Federal Court House in Boston after the building was evacuated, Wednesday, April 17, 2013. The U.S. Marshals Service in Washington says the courthouse was evacuated due to a bomb threat. Spokeswoman Nikki Credic-Barrett says authorities are conducting a security sweep. (AP Photo/Michael Dwyer)

Associated Press
A heavily armed United States Marshall stands guard outside the Moakley Federal Court House in Boston after the building was evacuated, Wednesday, April 17, 2013.  The U.S. Marshals Service in Washington says the courthouse was evacuated due to a bomb threat. Spokeswoman Nikki Credic-Barrett says authorities are conducting a security sweep. (AP Photo/Michael Dwyer)
A heavily armed United States Marshall stands guard outside the Moakley Federal Court House in Boston after the building was evacuated, Wednesday, April 17, 2013. The U.S. Marshals Service in Washington says the courthouse was evacuated due to a bomb threat. Spokeswoman Nikki Credic-Barrett says authorities are conducting a security sweep. (AP Photo/Michael Dwyer)
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