A hazardous materials crew was investigating at the presidential campaign headquarters of Sen. Marco Rubio Tuesday evening after a staffer opened an envelope with white powder inside, officials and a Rubio spokesman said.
The D.C. fire department was called Tuesday afternoon to Rubio's campaign office on the 200 block of E Street SW, near the Federal Center SW Metro station.
A suspicious white powder was found in an envelope a staffer opened, Rubio's communications director, Alex Conant, told NBC News.
The powder was found not to be hazardous, and the all-clear had been given by 6:10 p.m. Tuesday, a D.C. Fire and EMS Department representative said.
Additional information was not immediately available.