A driver has been shot after a car rammed into a barricade outside the US Capitol building and injured two police officers, law enforcement officials have said.
The officials told the Associated Press that the suspect was taken to hospital in a critical condition.
NBC News has since reported that the person who was shot is believed to have died.
Both police officers have also been taken to hospital and at least one officer is said to be in a serious condition.
Capitol Police have said the suspect was taken into custody.
They added that someone "rammed a vehicle into two USCP officers" at a checkpoint near the Capitol.
Staff inside the building in Washington DC were sent a message telling them no entry or exit was allowed and they were warned to stay away from exterior windows and doors.
The message added: "If you are outside, seek cover."
Sky News correspondent Alex Rossi, who is in Washington DC, said: "If you look at how officers are standing around - they are around the vehicle that was involved in the incident - it would suggest they believe the threat has been neutralised."
There were already extra barricades around the Capitol building in the wake of the riots on 6 January.
