A woman suffered serious leg injuries after being attacked Monday by a suspected bull shark in Sydney Harbour, local authorities said. The victim, a woman reported to be in her late 20s, was bitten on the right leg as she swam at Elizabeth Bay in Sydney’s east at about 8pm on Monday.

A witness said a local bystander helped the woman, who had dragged herself to safety onto a nearby wharf, by applying tourniquets to stem the bleeding until paramedics arrived. New South Wales state police said in a statement that the woman had been taken to hospital and was “in a stable condition.”