Amateur footage appears to show a number of police cars chasing a vehicle along a road near the US Capitol building.
ITV News cannot independently verify this video.
More top news
Bob and Mike Bryan said they were withdrawing from the Games over concerns for their families health.
The former boss of BHS said a parliamentary committee that investigated the closure of the stores was a 'kangaroo court'.
Those going out tonight might need an extra layer as it will be noticeably chilly.