A 12-year-old girl threw herself out of a moving car after it was stolen while she and her 11-month-old brother were still inside.
The shocking incident happend last weekend when, as the mother and adult relative left the car, an unknown man got in and drove off at speed.
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Frightened and scared, the 12-year-old girl managed to escape by throwing herself out of the car and into the road, but the baby remained in the car still strapped into his car seat.
Detectives said the baby was found a short while later uninjured on the doorstep of a house in Cheshunt, Hertfordshire, three miles away in North London.
Dramatic CCTV footage released by police shows how the woman's daughter managed to escape the vehicle as the thief was driving away.
Detectives continue to appeal for information and witnesses and are specifically appealing for the suspect to surrender.
Police say suspect is described as a white male, in his late teens, with light hair in a spiky style and possibly wearing a hooded top.
Detective Inspector Chris Rixon of Enfield CID said: "What happened is every parent’s worst nightmare and I’m specifically appealing for the suspect to give himself up now before it is too late.
"All the victims involved have been put through an awful ordeal, none more so than the little 12-year-old girl.
"The fact that she threw herself out of moving vehicle just shows how frightened she was.
"She is a very fortunate little girl as the situation could have been so much worse, it could have resulted in her sustaining significant injuries or could have resulted in her dying had she been hit by an oncoming car.
“I would like to take this opportunity to praise the bravery of the girl involved as well as thanking the member of the public who found the little boy on their doorstep. They took such great care of him and both the police and the child’s mother are very grateful.”
Anyone with information is asked to call the police non-emergency line on 101 or Enfield CID on 0208 345 3323.