A body has been recovered from the River Ribble in Preston.
Police and emergency services were seen on the riverbank at Avenham Park at around 3pm on Friday.
Lancashire Police confirmed a body was recovered from the water at around 3.30pm and an investigation was ongoing.
No further details have been released.
It is not yet known whether the discovery is linked to a previous search for a man, believed to have got into difficulty in the water last weekend.
A underwater search was launched after emergency services were called to a stretch of the river by a walkway close to Maritime Way, near Preston Docks, at 7.20pm on Sunday.
Police, firefighters, paramedics, coastguards and members of the RNLI all attended the incident, and a police helicopter circled the area close to where the man was spotted.
Searches were initially carried out on the banking of the river and in the river itself.
Witnesses said they spotted the man in the water close to the two-mile marker point of the Guild Wheel.
It is understood the man was shouting for help before he went under the water.
Shaun Walton, Preston fire station manager, said people out walking had spotted the man in difficulty.
He said: “I spoke to the people here and they were quite distressed. They had seen the man in difficulty.”
Mr Walton said the man was on his own and the witnesses said he could have been in his 30s, although this has not been confirmed. He said: “Unfortunately it is looking more likely that the person may not have survived.”