According to police sources, the conspirators led by Bhardwaj's younger son Nitesh had used mobile messaging app - Whatsapp and exchanged calls through secret numbers which were known to none.
The special task force and local police in Delhi analysed at least 200 numbers which eventually led them to nail Nitesh and Baljeet Sehrawat. The latter, who is also in police custody, informed police that Nitesh did not want to take any risk using mobile phones, hence had installed Whatsapp in his mobile.
Delhi police have been trying to retrieve the chats of the accused through the mobile messaging app. Police believe that Nitesh might have succeeded to dupe them if he had not committed silly mistakes of telling unconvincing lies.
The younger son of the slain BSP leader and real-estate tycoon raised police suspension for the first time when he claimed his mobile phone had slipped from his hand when he was trying to hold his father's body. Nitesh also refused to identify Sehrawat and another absconding conspirator - one self-styled godman Swami Pratibhanand.
However, the CCTV footage, which had captured faces of the two contract killers, led the police to crack the case. The shooters - Monu and Sunil informed police regarding the role of Pratibhanand. Police finally discovered the missing link after nabbing Sehrawat and Nitesh.
Police officials claimed that Nitesh, after being cornered completely by the investigators, confessed his crime and revealed that he hatched the conspiracy to kill his millionaire father six months earlier.
Nitesh allegedly had contacted a lawyer-cum-property dealer Shehrawat who wanted money to contest elections. Nitesh had made a deal with Baljeet and promised to give Rs 5 crore.
Baljeet contacted the self-styled godman and promised him to Rs 2 crore. The absconding godman allegedly had cherished to construct a ashram of his own. Hence, he appointed his driver Monu and another contract shooter Sunil to kill the real-estate tycoon.
The two killers, who reportedly had failed to kill Bhardwaj twice outside his Nitesh Kunj farmhouse in Delhi, finally succeeded to enter into the farmhouse and killed him on March 26. The two killers were promised Rs 1 crore.
Meanwhile, police sources informed the money, which was spent to kill Bhardwaj, belonged to Bhardwaj himself and it is also believed that it had come from his real-estate business.
Bhardwaj had lost general election in 2009 but shot to instant fame with his declared asset worth Rs 600 crore.