After her body fell on the road, the men fled the scene.
The men who hit a woman with their car and dragged her for about 13 km through the streets of west Delhi have made some new revelations during their interrogation.
The man who was driving the car has told the police that a few km after hitting Anjali Singh's scooty in the early hours of Sunday, he felt that "something was stuck" under the car, but the other four occupants asked him to drive on, sources say.
"It's nothing," they told him.
The five accused, sources say, have told the police that they fled the spot after the accident without realising that Anjali was dragged along.
Her body was later found on the road without clothes and with a broken back and leg in Delhi's Kanjhawala sending shock waves across the country on New Year.
They have also confessed to being drunk at the time of the crash. Official sources say they consumed more than two bottles of liquor inside the car.
The accident took place at around 2 am in Delhi's Sultanpuri on Sunday when Anjali, who worked at an event management company, was returning home from work.
While Deepak Khanna was driving, Amit Khanna, Manoj Mittal, Krishan and Mithun were sitting in the car.
After driving for a few km, Deepak had realised that something was tangled in the undercarriage of the car, officials said, adding that when he asked the other four men to check, they asked him to drive away.
The car was stopped in Kanjhawala's Jonti village after Mithun, who was sitting in the front next to Deepak, saw Anjali's hand while taking a u-turn.
After her body came off, the men, instead of getting down and helping her, drove away abandoning Anjali.
The accused then returned the car, a Maruti Baleno which was twice borrowed, to Ashutosh who had loaned it to them.
When police traced the owner of the car, Lokesh, he told them he had loaned it to Ashutosh, who loaned it to his friends Amit and Deepak.
Investigators have also found that Anjali was with a friend when the car hit her scooter. The friend, sources said, had fled the scene after the crash.
Anjali's friend Nidhi is now a crucial eyewitness, police said.
The men were arrested on Sunday night. They have been charged of culpable homicide not amounting to murder, causing death by negligence and criminal conspiracy.
In what may rule out sexual assault, an autopsy has found "no injuries to the private parts" of Anjali Singh.
Rekha, the woman's mother, had earlier suspected that Anjali may have been sexually assaulted. "Her clothes cannot be completely torn off. Her entire body was naked when they found her. I want a full investigation and justice," she had said.'
Home Minister Amit Shah, amid massive protests by locals, has directed Delhi Police Commissioner Sanjay Arora to conduct a thorough inquiry in the case.
Anjali Singh lived with her mother and younger siblings in Aman Vihar in Northwest Delhi. Her father died some years ago.