The Nashville offices of U.S. Sen. Lamar Alexander and former Vice President Al Gore were sent white powder in the mail last week and the incidents are being investigated by the FBI. The substances were not found to be dangerous, though a staffer in Alexander's office was decontaminated.
The Associated Press reports that envelops of powder have been sent to members of Congress and the Capitol rotunda was shut down briefly when a white powder was found there. The letters were mailed from a phony address in Portland, Ore. The sender who claims to have sent the letters said "10 percent" of them will contain a pathogen or some sort.
No injuries have been reported to this point.