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.
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Cloud and outbreaks of rain will ease away eastwards during the morning, clearing the east coast around midday with sunny spells developing.
Police and emergency services are attending the scene.
Rebel-held east remains at risk while the pumping station supplying the western part of the city is once again in operation.