A 13-year-old and her elder sister were allegedly abducted and gang-raped for two days in Tripura's Unakoti district.

Reportedly, the sisters boarded an auto-rickshaw and the driver picked up two male passengers, instead of dropping them home, the auto-driver, along with the other two, gagged them with towels and took them to Teliamura town in Khowai district.

The three then repeatedly raped the duo inside a room for two days.

The auto-rickshaw driver, believed to be the prime accused, has been arrested – police said.

After two days, the victims were released at the Teliamura railway station, where they informed the Government Railway Police (GRP) who, in turn, handed them over to the police on Sunday.

Police kept the victims in our custody and learnt about their details and informed their parents.

The auto-rickshaw driver was picked up on Thursday night on the basis of complaint filed by the the sisters' mother.

An investigation is on and the police are trying to nab the other two accused, Police said.