"Joginder, Sunil and Neetu, associates of Pawan, who was held yesterday, have been arrested from different areas of South Delhi. We are questioning them," police said.
Vinod, 48, who was on deputation with the Excise Department of Delhi government, was beaten to death and another constable badly injured when the duo were attacked by the assailants during a raid in a forest area near Ghitorni village of south Delhi.
A senior police official said that on the intervening night of December 27 and 28, excise officials received a tip-off that a few people were selling illegal liquor in the city.
The officials then gave chase to the alleged offenders and arrived at an isolated spot in Ghitorni village where some associates of the accused were already present.
"When the excise team tried to nab the accused, their associates attacked them with hockey sticks and sharp weapons. The constable duo received critical injuries in the attack. They were taken to AIIMS where Vinod succumbed to his injuries during the course of treatment," police said.
Meanwhile, family members of the deceased constable today alleged that he was killed due to the negligence of his colleagues.