The trial of five men charged with gang-raping and murdering a young woman on a bus in New Delhi opened on Tuesday with closed-door testimony from her boyfriend who appeared at court in a wheelchair, still bearing the scars of injuries from the attack.

The boyfriend, a 28-year-old software engineer, whose name has not been disclosed, came to the court to depose before the fast track judge who will now hear the case on a day-to-day basis.

"My son will go to any lengths to ensure that the guilty are punished," the father of the victim's boyfriend, who accompanied him into the court, told the media that has been barred from reporting the proceedings.