Emergency services are at the town bridge in March after a man was seen to jump into the river.
Police and ambulance services are at the scene and officers are seen to be trying to coax the man to come out of the water.
The man appears not to be in distress - one witness said he was "swimming about putting his thumb up to bystanders".
Our reporter at the scene said the man had appeared to move away from the bridge and further down the river but emergency service officers are thought to be close by.
More to follow
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here