Deputy Commissioner of Police (South) Chhaya Sharma said four people had been arrested for their involvement in the murder.
The arrested are Rakesh alias Bhola, the owner of the Skoda car used in the murder and shooters Sunil Mann alias Sonu, Purushottam Rana alias Monu. The fourth arrested is Amit, who was driving the car at the time of the murder.
Amit was arrested Sunday from northwest Delhi's Jahangirpuri area while Rakesh had been detained Friday after the recovery of the car from his possession.
The car had a fake registration number.
"An investigation is on. It is too early to say what was the motive for the murder. We cannot reveal who was the main conspirator behind the incident," Sharma said.
She added that police are yet to ascertain the involvement of Bhardwaj's family or any relative in the murder.
The Crime Branch of Delhi Police got a tip-off that both the shooters - Sunil and Purushottam - were to surrender in Patiala House Court here.
Police sources said Purushottam was apprehended from outside Patiala House Court complex Monday morning but Sunil managed to evade the police and entered Metropolitan Magistrate Prashant Sharma's court room to surrender.
However, the judge refused to hear the matter and handed him over to the Crime Branch police.
As police took Sunil outside the courtroom, a ruckus was created by people accompanying him.
Both the shooters were later handed over to South Delhi police, who are investigating the case. Sources said police had issued Look Out Circulars (LOC) to nab the alleged shooters.
Police have questioned Bhardwaj's wife Ramesh Kumari, their sons and staff over the past few days.
Investigators are also looking into the role of an insider who might have tipped off the killers about the movement of Bhardwaj and the topography of the farmhouse.
Bhardwaj, a realtor and the richest candidate in the 2009 Lok Sabha elections with declared assets of over Rs.600 crore, was shot dead March 26 around 9 a.m. at his 35-acre farmhouse in Rajokri in south Delhi.
The killers entered the farmhouse on the pretext of meeting Bhardwaj. He was shot in the head and chest.
--IANS (Posted on 01-04-2013)