US Capitol Police are investigating a "suspicious vehicle" near the Supreme Court building and urged people to stay away.
"We are investigating a suspicious vehicle in front of the Supreme Court along First Street, NE," the police tweeted. "Please stay away from the area."
In another tweet, the police also announced a number of road closures in the vicinity.
The police added that they're continuing to investigate the matter and that they will provide more information when they can.
Shortly afterwards, they tweeted that they are trying to talk to the driver, and again advised the public to avoid the area.
Eventually, the US Capitol Police posted that they have managed to extract "the man" from the vehicle.
"The man is in custody. Everyone is safe," the tweet said.
Deputy Police Chief Jason Bell has revealed that the US Capitol Police found no weapons in the vehicle.
"This time no weapons have been found. That is currently under investigation, and it's still an active crime scene," Bell said during a press conference. "We don't have motivation at this time."
The suspect has been identified as Dale Paul Melvin.