Three men were stabbed during a fight in front of a reception centre on South Street on Saturday night.
Rosehill, Parramatta and Holroyd police as well as the Dog Squad and the Public Order and Riot Squad attended.
During the altercation three males, aged between 18 and 30, received stab wounds.
They were all taken to hospital. One victim is understood to be in a serious but stable condition. The conditions of the other two men in unknown at this stage.
A crime scene has been established and police are now searching for one male offender.
Investigations are ongoing and no further details are available at this stage.
Anyone with information about this incident should call Crime Stoppers on 1800 333 000 or use the Crime Stoppers online reporting page: https://www1.police.nsw.gov.au/.