Three cats in the Olveston area have died from suspected antifreeze poisoning.

The product, found in car radiators and some screen washes, can be toxic to cats.

Letters from the Thornbury neighbourhood police team have been sent out to residents.

The letter states: "Whilst we acknowledge the fact that due to the cold weather antifreeze may be used, we remind residents to be careful and considerate.

"This includes ensuring the lids on antifreeze are securely closed, storing the antifreeze in a safe place and being extremely careful of spillage.

"To all pet owners, please ensure you aware of the symptoms of antifreeze poisoning to ensure the fastest treatment for your pet.

"It is suspected that it only takes 5ml of antifreeze to poison a cat which causes their kidneys to fail.

"Symptoms to be aware of include: vomiting, extreme stillness/quietness, appearing almost as if they are drunk.

"Whilst we hope these suspected poisonings are unintentional, we must reiterate that under the Animal Welfare Act 2006 it is a criminal offence to purposely poison a cat.

"Anyone found guilty will face a maximum penalty of up to 6 months in prison and/or a £20,000 fine.