Thames Valley Police cordon off a stretch of towpath along the Kennet & Avon Canal at Newbury
The towpath at Newbury Marina has been cordoned off by police and is likely to remain shut for several hours.
Pedestrians walking from Newbury are being diverted over the bridge to Mill Lane.
UPDATE: Thames Valley Police have told Newburytoday that the incident 'relates to a fear for welfare medical episode of a man'.
A police spokesman said the path between Greenham Mill to back of the London Road Tescos is likely to remain shut 'for several hours' and it is best to seek an alternative route.