US

Man detained after driving truck on grass at National Mall

  • A pickup truck, left, is parked on the National Mall with the Lincoln Memorial and Washington Monument behind, Tuesday, May 17, 2016 in Washington. Authorities say a man drove the pickup truck onto the grass at the National Mall and said he thought he was exposed to anthrax. (AP Photo/Alex Brandon)

    A pickup truck, left, is parked on the National Mall with the Lincoln Memorial and Washington Monument behind, Tuesday, May 17, 2016 in Washington. Authorities say a man drove the pickup truck onto the grass at the National Mall and said he thought he was exposed to anthrax. (AP Photo/Alex Brandon)  (The Associated Press)

  • A pickup truck is seen on the National Mall with a robot near and first responder in gas mask nearby, Tuesday, May 17, 2016 in Washington. Authorities say a man drove the pickup truck onto the grass at the National Mall and said he thought he was exposed to anthrax. (AP Photo/Alex Brandon)

    A pickup truck is seen on the National Mall with a robot near and first responder in gas mask nearby, Tuesday, May 17, 2016 in Washington. Authorities say a man drove the pickup truck onto the grass at the National Mall and said he thought he was exposed to anthrax. (AP Photo/Alex Brandon)  (The Associated Press)

  • Authorities use a robot to examine a pickup truck that was parked on the National Mall, with the U.S. Capitol behind, Tuesday, May 17, 2016 in Washington. Authorities say a man drove the pickup truck onto the grass at the National Mall and said he thought he was exposed to anthrax. (AP Photo/Alex Brandon)

    Authorities use a robot to examine a pickup truck that was parked on the National Mall, with the U.S. Capitol behind, Tuesday, May 17, 2016 in Washington. Authorities say a man drove the pickup truck onto the grass at the National Mall and said he thought he was exposed to anthrax. (AP Photo/Alex Brandon)  (The Associated Press)

Authorities say a man drove a pickup truck onto the grass at the National Mall and said he thought he was exposed to anthrax.

U.S. Park Police tell NBC4-TV that the man drove onto the mall Tuesday afternoon in front of the Capitol, near the reflecting pool, where officers could be seen wearing gas masks and talking with a man wrapped in a blanket, and a robot appeared to be checking the truck.

Authorities closed several streets in the area, and emergency responders were told to suit up, but firefighters quickly determined there was no hazardous material, fire department spokesman Doug Buchanan said.