The accused have been identified as Vikram Rana and his associate Shri Krishan, both residents of Haryana, DCP (Outer) Vikramjit Singh said.
On January 27, the police found the body of a man with several bullet injuries at Samaipur Badli area, following which a case of murder was registered. The man was later identified as Gulshan Rai Thakkar, a businessman residing in KN Katju Marg in outer Delhi who was reported missing since December 2015.
Later, some locals told the police that they had spotted Thakkar a few times even after he was reported missing and they suspected that he was involved with a particular infamous gang in Haryana, police said.
During interrogation, it emerged that around one year ago, a fight broke out between the families of Rana and Thakkar over the issue of parking in the street near their house. One evening, a fight broke out between the families, during which Thakkar slapped Rana's father.
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When Rana charged Thakkar for his act, another scuffle broke out during which Rana's father bit Thakkar's arm. The police was soon informed and the matter was settled for the moment, but Rana still held a grudge, police said.
On January 27, Rana along with another associate, Sandeep, who is still at large, allegedly shot dead Thakkar at Haryana's Sirsa and dumped his body at a secluded spot in Samaipur Badli.