A baby, who was believed to be inside the car when a woman tried to ram it through the security barricades at the White House, was reportedly aged between 12 and 18 months, NBC News in Washington said.
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The man was taken early this morning to a south London police station where he remains in custody.
The Chancellor faces tough talks to build a Government while also dealing with the challenge from a resurgent far right.
Watch John McDonnell's speech at Labour Party conference 2017 live as he speaks to Brighton the audience from 12.15pm.