Police opened fire at Washington's Capitol Hill after a woman drove at officers.
US Capitol Police fired shots after a suspect drove into a police cruiser before attempting to run down officers on Wednesday, Washington Police said.
Staff were ordered to stay inside their offices due to “police activity", an internal memo leaked on Twitter said.
Dramatic images posted on social media showed emergency services swarm the area.
Bystanders reported hearing up to three gunshots.
Scott Ferson wrote on Twitter: “Cops ran to base of hill. Sounded like three shots fired”.
No one was injured during the incident at the base of Capitol Hill, and the driver has been arrested, Capitol Police spokeswoman Eva Malecki told reporters.
Capitol Hill Police Car Attack - In pictures
"Although preliminary, this incident appears criminal in nature with no nexus to terrorism," she said.
Capitol's Metropolitan Police earlier said the suspect was a man.
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