A crime scene was established at a townhouse complex on Watkins Road in Baulkham Hills after a man, believed to be in his late 30s, was found dead at 10.15am today.
Police said they were called to the property after a concern for welfare report.
Two other bodies, believed to be a woman aged in her early 40s and a young child, were located at the Lion’s Taekwondo martial arts centre in North Parramatta at 1pm today.
The crime scenes are being treated as linked, police have confirmed.
Daking Street, where the studio is located, has been closed off as investigations continue.
9News understands another man is speaking to police after he attended a hospital with non-life-threatening stab wounds last night.
Police are working to confirm the links between that man’s injuries and the three bodies.
Multiple crime scenes have been established and are being examined by forensic officers.