Three accused arrested in the Dhaula Kuan gangrape case, including the gang leader who was arrested on Monday night, refused to be part of a test identification parade (TIP) for the victim.
The police said they would depend on material and circumstantial evidence to nail the accused now.
The fifth accused, Kamruddin alias Mobile, was arrested from Lakhuwas village near Gurgaon on Monday night.
The police reportedly took the help of the panchayat leaders to nail the accused as he was taking shelter at the house of some relatives.
Earlier, too, Kamruddin was arrested in another case of gangrape. Kamruddin had managed to give the police a slip when they had gone to raid his village in the Mewat region of Haryana.
The police said they will seek the remand of Kamruddin and the two other accused, Shahid and Iqbal, on Wednesday and will jointly interrogate them.
Two other accused, Shamsad and Usman, are already in police custody for five days and have been identified by the victim during an identification parade.
The police said the five accused would be subjected to interrogation together when they are in their custody.
“All of them would be grilled together. All material and circumstantial evidence would be brought on record to build a watertight case against them,” said HGS Dhaliwal, deputy commissioner of police (south).
During the course of interrogation police had studied 105 similar cases reported from in and around Delhi.
The police said the initial questioning of the two accused in their custody revealed that they could be involved in similar cases in Delhi and adjoining areas such as Noida, Gurgaon, Ghaziabad and Faridabad.
The country-made weapon, mattress and the clothes of the accused have not been recovered yet.
The pick up van that was used to abduct the victim has been sent for forensic examination and the reports are awaited soon.
The accused had purchased the van only few days before the incident took place.
The victim, a 30-year-old BPO employee, was abducted and gangraped by the accused when her office cab dropped her near her home in south Delhi.
The accused tried to abduct her colleague as well but she managed to escape.
The victim, who was living in an undisclosed location, has returned to her rented accommodation after the arrests.