"We would advise people to keep off this stretch of beach for the time being until it has been cleared and also not to fish in the vicinity of the incident," they said.
“We encourage members of the public to report any environmental impacts to our incident hotline on 0800 80 70 60.”
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In a separate incident, the Environment Agency are investigating after dead fish were spotted in the River Conder at Galgate.
Residents reported the incident, and were told an "accidental spillage" had taken place.
An Environment Agency spokesman said: “We are aware of a pollution to the River Conder. Due to ongoing investigations into this matter, we are unable to comment further at this time.
“Environmental incidents can be reported to the Environment Agency’s 24/7 incident hotline on 0800 80 70 60.”