Police are appealing for public assistance after a man was found injured in St Marys this morning.
About 12.30am today, emergency services were called to Thomas Street, St Marys, after a 40-year-old man was found with facial injuries outside a home.
He was treated at the scene by paramedics before being taken to Westmead Hospital.
Officers attached to Nepean Police Area Command established a crime scene and conducted a search of the area.
Initial inquiries suggest the man had been assaulted, however, detectives are continuing to investigate how and where he sustained his injuries.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000.