A group of teenagers was reportedly seen kicking and stamping a duck until it died from its injuries.
The RSPCA has appealed for information from anybody who might
The alleged offence took place last Friday (4 July) at around 10pm near the bridge over the river by Sainsbury's car park on Chapel Street..
There were complaints that several ducks were attacked and kicked by a small crowd of young people and one was stamped on the head.
The allegations were discussed on social media sites and then complaints raised and forwarded to the RSPCA.
RSPCA inspector Emily Cheeseman said: "We are very disturbed to hear about these attacks and ask anyone with any information to come forward and let us know.
"If the reports are true, there is absolutely no excuse for treating a live animal in such a brutal and callous manner and it is an offence.
"We urge people to treat the wildlife around them with respect they deserve."
Anyone with any information should call the RSPCA, in complete confidence, on 0300 123 8018.
