Port Erin Coastguard is warning of a mysterious white substance which has washed up on the village's beach.
It's said to be 'lard like', has a waxy appearance and a faint smell of petrol.
The pieces vary in size from that of a golf ball to about a foot square.
Samples have been taken away to be analysed.
Dog owners are advised to keep their animals on a lead, and away from the substance.
The police say if you find anything on the Island's coastline matching the above description call 999 and ask for the coastguard.
Police appeal to find three individuals to help with investigation
Dates for offshore windfarm scrutiny meetings announced
Some residents in Onchan without power
January's inflation rate stays the same
Child benefit payments delayed due to technical issue