Cats are being poisoned in the Thornton area, police fear.
Officers have taken calls from a local vet, and two owners about suspected poisoning cases in recent days – prompting an appeal for information.
“This seems to be focused around the general residential area of Sandyforth Avenue, Longton Avenue, and Gordon Avenue,” a spokesman said.
The force was unable to say whether the cats had been deliberately targeted, or whether they survived their ordeal.
Anyone with information has been asked to call the RSPCA on 0300 1234 999,