A man and a boy have been killed in a holiday tragedy at Wedge Island.

Police say the pair were found unresponsive yesterday about 10.50am – while a woman was flown to Royal Perth hospital for treatment.

Initial investigations suggest the deaths may have been a fault with camping equipment inside the tent the family were sleeping in.

Investigations are ongoing.

Anyone who was in the area at the time are urged to contact police via Crime Stoppers on 1800 333 000.