One person was also injured in the shootout incident that took place late last night, police said.
The three were working at a slaughter house on the Agra-Etmadpur road.
The victims Asif (22) and Imran (19) were declared brought dead by the doctors at the local S N Hospital while 20-year-old Sajid is undergoing treatment for his bullet injuries, said ASP (Rural) Ashfaq Ahmed.
A case has been registered against eight persons but no arrest has been made so far, he said, adding that some arms and ammunition were also recovered from the spot.