"Three people have been detained... we are very close to cracking the case," a police officer told IANS but declined to divulge further details.
Anmol Sarna, from New York, succumbed to his injuries in hospital late Friday after he was attacked with a heavy object in a scuffle while partying with friends in south Delhi. He was found in a pool of blood outside Southpark Apartment in the Kalkaji area.
Police had also questioned his friends.
Photos: Sunny Deol with sons Karan and Rajvir at Mumbai airport
Photos: 10 beautiful moments that capture winter around the world
Muhammad Ali birth anniversary: Top boxing films of all time in pics
Photos: Karisma Kapoor, Preity Zinta, Shraddha Kapoor at Mumbai airport
Spotted: Anushka Sharma and Diljit Dosanjh at Mumbai studio