Olympic and world champion Mohamed Farah - who won several gold medals in athletics - said that he was brought to Britain from Djibouti, at the age of nine, and forced to do housework and take care of children in exchange for food.

He added to the British Broadcasting Corporation "BBC" (BBC) that his name had changed to Muhammad Farah from Hussein Abdi Kahin in the fake travel documents used by a woman he had not met before, to deport him to Britain.

His family was dispersed in Somalia - the place of his birth - after his father was killed in the civil war, when he was four years old, then he was taken from his mother and forced to come to Britain.

Farah, 39, continues that as soon as he arrived in Britain, the woman took him to her home in Hounslow, west London, and tore a paper with the contact details of his relatives, and the woman's family did not allow him to go to school until the age of 12 years.

Sir Mo Farah has revealed he was "trafficked" into the UK illegally under the name of another child, saying he wants to tell his real story "whatever the cost".

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"For years I've been holding out on this, but you can't withhold that information for long," he said in the BBC documentary, which will be broadcast this week.

"I would often lock the door in the bathroom and cry. The only thing I could do to get away from this (living situation) was to go out and run."

Farah mentioned that his physical education teacher, Alan Watkinson, called the Department of Social Services and helped him find a foster family from the Somali community after Farah told him what he was going through.

"I felt like a lot of things were thrown off my shoulders, and I felt like I found myself. This is the moment when the real Mo.. the real Mo," said Farah.

"I had no idea there were so many people going through exactly the same thing I went through. It just shows how lucky I was," he added.

"What really saved me, and what made me different, is that I can run," he concluded.

And Mohamed Farah said, last May, that his track racing career may end after he finished second in the London race for 10 thousand meters and ruled out participating in the world championships this July.