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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"I will work with him where we can, but I just didn't want to go celebrate or legitimise or normalise his presidency," one US lawmaker said.
Former US President George H.W. Bush is in intensive care after suffering from pneumonia, as his wife is admitted as a precaution.