The three policemen have been identified as Assistant Sub-Inspector Manoj Kumar and constables Mohit Kumar and Paramveer. They were attached to R K Puram police station.
Earlier, several locals staged a protest outside the police station here this morning over the alleged assault on the four youths and demanded action against the erring policemen.
"The three policemen have been sent to police lines pending inquiry against them. They have been accused of badly beating up four people who were arrested Sunday night after a group clash between in Ekta Vihar," said a police officer.