Police are yet to make any arrests two days after the deaths of liquor baron Ponty Chadha and his brother Hardeep.
Several people have been detained for questioning, but no one has so far been arrested, said reports.
The two bodies were cremated on Sunday following a second post-mortem of Ponty´s body because three bullets were still lodged inside.
Police have already registered two FIRs and detained at least 15 people in connection with the death of Ponty and his brother Hardeep, who were killed in a shootout between their groups inside their farmhouse at Chattarpur in south Delhi on Saturday.
Sources told media that Hardeep first shot Chadha and the liquor baron´s gunmen fired back at him.
Ponty was brought to hospital at around 1 pm where he was declared dead.
According to reports, 12 bullet wounds were found in Chadha´s body while his brother got four wounds.
Ponty´s business empire is worth Rs 6000 crore.
"There was a family dispute that was there," Gaurav Kanth, who was lawyer of Ponty´s brother Hardeep, earlier said. He said there were issues but he was not sure of what exactly caused a flash point.
Chadha and his two brothers also owned the Chadha Group, which was consolidated under the Wave brand.