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Poisonous blue-green algae has appeared in the pond at Parc Cwm Darran, near Deri, Caerphilly County Borough Council has confirmed.

The council has urged residents to ensure pets, particularly dogs, do not enter the pond water.

Should pets come in contact with the water, owners should wash the animal with clean water and seek precautionary advice from a vet, environmental health officers have said.

Blue-green algae, also known as cyanobacteria, occurs naturally in rivers, streams and lakes.

The algae can produce toxins harmful to both humans and animals, causing rashes and irritation, and illness if swallowed.