Police investigate after suspicious white powder washes up on Hinchinbrook Island

Queensland detectives have put out a public appeal after 10 packets of a suspicious white powder washed up on a beach on Hinchinbrook Island.

Members of the public contacted police after discovering the packages at the high tide mark on the beach at Ramsay Bay on Sunday.

Forensics experts are examining the 10 kilogram haul, but it is suspected to be cocaine.

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If found to be cocaine, it would have an estimated street value of more than $3 million.

Investigators from the Major and Organised Crime Squad (MOCS) Far Northern and Cairns District are searching the area as part of investigations.

Police are warning the public not to handle any packages they find, saying more may yet wash ashore in the surrounding area.

"Anyone who was at sea or on the coastline near these locations and saw anything suspicious in the water or other suspicious activity is urged to contact police," Detective Acting Senior Sergeant Camp said.

"We urge the public to contact police should they find further packages and to not open them as the substance could be hazardous."

If you have information for police, you can contact Policelink by providing information using the online suspicious activity form at www.police.qld.gov.au/reporting.