Authorities say the Tucson office of Arizona Rep. Raul Grijalva was evacuated Thursday after an envelope containing a white powder was discovered in the mail.
A spokesman for Grijalva says the congressman was not at the office when a staffer discovered the envelope, which had swastikas either written or stamped on the front.
About a dozen people in the office were evacuated by Tucson police, who say the FBI is investigating the substance and who may have sent it. Calls to the FBI officials were not immediately returned.
Grijalva is seeking a fifth term representing the district which includes western portions of Tucson and Pima County, much of Santa Cruz County and the entire far southwestern corner of the state.