Since September 11, 2001, a number of high-profile incidents and security scares have occurred in Washington. In October 2001, anthrax attacks, involving anthrax-contaminated mail sent to numerous members of Congress, infected 31 staff members, and killed two U.S. Postal Service employees who handled the contaminated mail at the Brentwood sorting facility. An FBI and DOJ investigation determined the likely culprit of the anthrax attacks to be Bruce Edwards Ivins, a scientist, but he committed suicide in July 2008 before formal charges were filed.