Solidified palm oil, which is poisonous to dogs, has washed up in a popular dog walking spot.
The substance has washed up between Newhaven eastern arm and Splashpoint, Seaford.
Solidified palm oil is a white, waxy substance. Dogs also seem to like it and will eat it given the chance.
It can cause vomiting and diarrhoea in dogs which can lead to dehydration. It is not toxic to humans.
Palm oil previously washed up on the beach in October last year and Lewes District Council cleared it away. Before that, it appeared on the beach in February after a ship lost its load off the coast of Cornwall.
Jim Skinner, chair of the Friends of Tide Mills, said, “Please ensure dogs are kept under close control as they can adversely react to palm oil, often fatally.
“The Environment Agency and Lewes District Council have both been informed.”