The US Capitol police chief has told waiting reporters that they believed there was a child in the car involved in the incident and that he did not have any information on the person driving the car.
He said that multiple scene involved are now secure and said he had no information that the incident was related to terrorism and is anything other than an isolated incident.
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The PM urged Tory MPs not to side with Jeremy Corbyn by opposing British airstrikes against Islamic State in Syria, ahead of a Commons vote.
Armed police have taken part in a dramatic training exercise aimed at recreating the chaos of a Paris-style terror attack.
After a remarkably mild November - a notable mild start to the new month.