A suspicious vehicle was near the Supreme Court on Tuesday morning.
Capitol police say they now have a man in custody in connection with the vehicle.
The suspect is 55-year-old Dale Paul Melvin of Kimball, Michigan.
He was removed from the SUV and placed under arrest.
Melvin was allegedly parked illegally and refused to talk to responding officers, authorities said.
Crisis negotiation officers were brought to the scene, ABC News reported.
More on the situation from ABC News:
There’s no information on motive and no weapons have been found, police said.
Everyone is safe, police said.
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There were no disruptions to operations at the Supreme Court; oral arguments began as planned at 10 a.m.
The Supreme Court building remains closed to the public.
This is a developing story. Please check back for updates.