The incident occurred around 8.15 pm. All three were taken to a nearby hospital, where Govind (25) and Satish (40) were declared dead, and Mukesh (30) was undergoing treatment, they added.
Sources said several rounds were also fired by the assailants and added that the attack was a result of gang-war.
The bodies would be taken for postmortem, DCP (Rohini) Rajneesh Gupta said.
All three belonged to Bamkner in Narela and had criminal background, he said.
An investigation was underway, the DCP added.