Legal challenges failed to prevent the release. The victim's parents were among those detained later at a rally.

The rapist, who cannot be named as he was a minor at the time of the crime, was sentenced to a maximum three years in a reform facility in August 2013.

The rape and the subsequent death of the woman caused global outrage.

Although the convict is now an adult, he was tried as a juvenile and has served the full sentence allowed.

He has now been handed over to a charity, where he will remain because of fears over his safety.

Four adult convicts in the case are appealing against death sentences. A fifth died in prison.

-BBC