Fatty deposits of a white, lard-like substance continue to be found washed-up on beaches around the Island.
The government analyst has confirmed they are animal or vegetable based, but where they've come from remains a mystery.
Coastguards collected sackfuls of the fatty lumps at the weekend and warned dog walkers not to let their pets near them.
Inquiries are being made into the possibility the fat was discharged or leaked from a ship passing the Island.
Senior coastguard watch officer Chris Burton says although not harmful it's unpleasant stuff - and is starting to smell:
Clip 1
Photo ID requirements could create 'faff' at borders, says Steam Packet boss
DHSC minister 'absolutely committed' to reopening Ramsey hospital
Enterprise minister 'optimistic' following challenging period for tourism sector
Plans to protect Douglas Head to be laid before Tynwald in May