The heroic boy refused to let go of the car of the sex offender who had kidnapped his big sister.
The nightmare unfolded just outside the village of Cullahill in Laois in Ireland.
The 34-year-old rabid perpetrator, who was released on bail for a charge on robbery, attempted to kidnap the 12-year-old girl from the roadside.
She was playing with two of her brothers outside the family's house when a man stopped and asked for directions to the local parish. Then he suddenly leapt out of the car - which he obviously had stolen - and snatched the girl, writes Irish Independent.
Then her two years younger brother went crazy! He plunged through the open window on the driver's side of the car, which was already in motion, and smacked the man.
The brave little boy distracted the perpetrator long enough that her sister managed to get out of the car.
According to a press release from the Garda, the Irish police force, the man is now detained.
The father says they are in shock, but also very proud of 10-year-old who intervened.
The 34-year-old pedophile is well known to police, partly for burglary and is described as "violent and dangerous" by the police, reports the Irish newspaper.
He was in 2004 sentenced to four years behind bars for having abducted a 14 year old girl. The man then claimed that he had a relationship with the girl.
Police are investigating the case, and hope the children will be able to identify the man during a line up.
The article picture shows the surveillance photo of the silver Jeep that the now arrested man had stolen and tried to use in the failed kidnapping attempt.
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