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Poisonous blue-green algae has reappeared at Pen y Fan pond,  Caerphilly County Borough Council has confirmed.

It is the sixth time in around four years that blue-green algae has been discovered at the pond, which is near Oakdale.

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.

Signage has been put up around the pond and regular inspections of the water will be carried out, the council has said.