Police are appealing for information after three cats were poisoned in Kilburn.
The creatures were all targeted in Dale View Gardens at the end of July.
PC Neil Hopwell is investigating the deaths.
He said: “This is a particularly cruel thing to do and we would ask anyone with information to contact us.”
The poisoning of a cat can be a criminal offence.
Under the Animal Welfare Act 2006 the maximum penalty for anyone found guilty is up to six months imprisonment and/or a fine of £20,000.
If you have any information which could help police call the force non-emergency number on 101.