NEW DELHI -- A New Delhi court on Thursday confirmed the death penalty imposed by a lower court to four men convicted for the gang rape and murder of a young woman on a moving bus in 2012.

A special fast track court had sentenced the men in September, saying their crime was one of the rarest of rare cases that warranted the death penalty.

The Delhi High Court dismissed the appeals filed by the men and said it "affirmed" the sentence given by the lower court.

The 23-year-old medical student and a friend were returning home from a movie when the men tricked them into boarding a bus they were joy-riding. They beat the friend into submission, held the woman down and took turns raping her. They also penetrated her with a rod, causing severe internal injuries that led to her death two weeks after the December 2012 attack.

The brutality of the crime unleashed a wave of public anger over the treatment of Indian women and a long-unspoken epidemic of sexual violence in the country.

All six men involved in the attack were arrested soon after the attack.

Police say one of the men hanged himself in prison. Another man -- an 18-year-old who was a juvenile at the time of the attack -- was convicted and ordered to serve three years in a reform home.

A defence lawyer said the men would appeal Thursday's decision in the Supreme Court.

"These men have been falsely implicated," A. P. Singh, a lawyer who has represented the four men at various times during the trial, told reporters.

The nationwide outcry following the gang rape led the federal government to rush legislation increasing prison terms for rapists and criminalizing voyeurism, stalking, acid attacks and the trafficking of women.