Arizona congressman receives hoax anthrax letter

An FBI spokesman has announced that a suspicious powder sent to an Arizona congressman was found to be nontoxic.

Campaign spokesman Adam Sarvana told CNN that staff members of U.S. Rep. Raul Grijalva in Tucson, Arizona, discovered the envelope last week. The staffers found a white powdery substance and drawings of two swastikas inside the envelope.

Sarvana told CNN that approximately 12 people were at the office when the incident occurred. The office staff members were all checked at the scene by local authorities and then sent home for the rest of the day.

FBI spokesman Special Agent Manuel Johnson told CNN that scientists at an FBI laboratory in Phoenix, Arizona, conducted a full analysis of the substance. Those tests came back negative for anthrax or any other harmful substance by midday the following day.

Johnson declined further statement, saying that the investigation was still ongoing. Sgt Kimberly Schneider, a spokeswoman for the U.S. Capitol Police, said her agency was also participating in the investigation.

Sarvana told CNN that the incident was the third security issue at one of Grijalva’s district offices this year.

“It's just a continuation of a problem we've been having,” Grijalva said, according to CNN.

In April, Grijalva closed two local offices for an afternoon after receiving threats regarding his position on controversial immigration legislation. In July, a bullet shattered a window in his Yuma, Arizona, office.

“I do feel a great deal of concern for the people that work with me, for me," Grijalva said, CNN reports. "I feel concerned for the constituents that come to that office. Obviously, we're going to have to make more changes.”