The 18-month-old child who was in the car during a chase near the White House was not injured and has been placed with child protective services.
NBC News cites law enforcement sources as saying that the child is believed to be the driver's daughter.
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A report shows many children are leaving themselves open to online predators by failing to set their social media profiles to private.
Police officers made the grim discovery after being directed to a flat in Cannon Street by a man who claimed he had killed a man.
Anti-austerity campaigners say it proves cuts have gone too far "when even David Cameron’s mum has had enough".