Rajvir and Sunny Bharadwaj were arrested from Dwarka following a tip-off from a gunrunner from whom they purchased a pistol for execution of the robbery, a senior police official said.
Rajvir allegedly planned the entire act and the gang members had met for the first time on the day of the crime, police said.
According to police, the incident took place in the evening before Holi when the gang targeted a 61-year-old Karol Bagh-based forex trader when he was heading home and robbed him of around Rs 15 lakh cash and foreign currency estimated at Rs 12 lakh at gunpoint.
Taking leads from that point, the police arrested Rajvir and Bharadwaj from their hideout in Dwarka.
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During interrogation, it emerged that Rajvir, a native of Bahadurgarh in Haryana, was a failed entrepreneur who later used to work for a transporter of dry fruits. He used to travel to Hong Kong and Kolkata for work purpose and became friends with the Karol Bagh-based forex trader.
With the help of his friend, he soon started tracking other forex traders and targeted the 61-year-old because of his age and the proximity of his residence to the Delhi-Haryana border area with which Rajvir was very familiar.
"The gang members took lots of precautions and did not interact with each other before or after the crime. They met only once on the day of committing the crime and did not even introduce themselves to each other," the official said, adding that a hunt is on for the other accused.