The RSPCA is appealing for information after a woman was seen throwing a cat into the water at the London docks.
Passers-by said they saw a middle-aged female carrying a basket to the Greenland Quay at around 8.30pm on Sunday 28 July. She then took a tabby female cat out of the basket and threw her into the Thames.
Quick-thinking members of the public managed to lift the cat to safety.
She has now been taken into care and nicknamed Ariel after the Little Mermaid. The RSPCA say she is recovering well.
RSPCA inspector Callum Isitt said: "It is impossible to know what could have made this woman throw the cat into the water like that."
The woman also had a dog with her, who she had tied to a post while she threw the cat into the water, and then took away with her.
Anyone with any information are urged to contact on 0300 123 8018.