Two cyclists have been seriously injured following a crash in Belrose on 4 June early morning.

About 6am, emergency services were called to Forest Way, after reports of a crash involving two cyclists and a car.

Officers attached to Northern Beaches Police Area Command attended along with NSW Ambulance paramedics, who treated two cyclists for serious injuries.

A cyclist was airlifted to Royal North Shore Hospital in a serious condition, while the other cyclist was also taken to hospital with serious injuries.

The driver – a 24-year-old man – was uninjured and taken to hospital for mandatory testing.

A crime scene has been established, and an investigation into the circumstances surrounding the crash has commenced.

Anyone with information in relation to the incident is urged to contact Crime Stoppers on 1800 333 000.