Update on 15 March at 1.55pm:
The Department of Primary Industries and Regional Development has sought expert scientific opinion on what caused the injuries to two 10 year-old boys, who suffered bite wounds in a suspected shark interaction at Watermans Bay Beach.
Photos of the injuries were supplied to us for investigation, by a relative of one of the boys.
We have been advised the injuries were not consistent with a shark bite, but some other marine animal.
As a result we are downgrading the alert issued overnight, however, water users should be careful in the marine environment at all times.
Alert issued 14 March 2018:
A shark WARNING has been issued for Perth Metropolitan Waters between Sorrento Beach and Trigg after a possible shark interaction was reported at Watermans Bay Beach this evening.