It’s believed bones found in the Royal National Park in Sydney’s south are human.

Officers from Sutherland Police Area Command were called to Sir Bertram Stevens Drive in the park when the discovery was made late yesterday afternoon.

A driver who stopped to go to the bathroom made the find, sparking the police investigation.

Police have established a crime scene and are combing through the thick bushland area.

The skeletal remains are believed to be human, but still need to be forensically examined.

Anyone with information about this incident is urged to contact Crime Stoppers on 1800 333 000