A US Capitol police officer was killed and a second injured Friday after a vehicle rammed through security and crashed into a barrier at the Washington complex.
The US Capitol was forced into a lockdown less than three months after a mob assault on Congress.
Capitol Police shot dead the driver after he jumped out of the car and lunged at them with a knife, officials said. US media identified the attacker as Noah Green, a 25-year-old Black man from Indiana.
President Joe Biden, who was with First Lady Jill Biden at Camp David for the Easter holiday, offered his "heartfelt condolences" to the family of the police officer killed in the attack.