Joe Biden expresses sorrow after police officer killed in Capitol attack

Mr Biden said in a statement he and wife Jill Biden sent their condolences to the family of the officer who was killed, who police identified as William “Billy” Evans

Authorities investigate the scene after a man rammed a car into two officers at the barricade on Capitol Hill in Washington (Alex Brandon/AP)

Joe Biden has said he is heartbroken after a police officer was killed when a man rammed a car into two officers at a barricade outside the US Capitol in Washington DC and then emerged wielding a knife.

Video showed the driver of the crashed car emerging with a knife in his hand and starting to run at the pair of officers, Capitol Police Acting Chief Yogananda Pittman told reporters.