A “reckless” man prompted a full-scale response from the emergency services after jumping from Wisbech Town Bridge for a joke.
The police helicopter and officers were scrambled to the town centre bridge on Saturday evening after a drunk man decided to leap into the River Nene.
Firefighters and paramedics were also called to the scene to help the man, who was arrested and later released without charge.
Fenland’s Insp Will Davis said the man had endangered officers.
He said: “His actions were incredibly reckless and put not only his life in danger but those who would try to come to his aid.
“The male thought the whole thing was a joke and failed to see the seriousness and consequences of his actions.”
The man was spotted on the town bridge by a Fenland CCTV operator at 11.45pm and raised the alarm.
Firefighters, ambulance crews, the harbour master and the police helicopter were called.
The Wisbech police Facebook page states: “The male was seen to get himself to the side of the river and climb out.
“The male was drunk and thought it was funny to be jumping into the dark and fast flowing river.”
He was arrested after being checked over by paramedics and taken to the King’s Lynn Police Investigation Centre, but he was later released without charge.
n Cambridgeshire Police is looking to increase its share of the council tax to raise more money in a bid to balance its books.
The Fire Authority faces further cuts of up to £3.9m over the next four years, having received confirmation of its grant settlement from the Government at the end of December.
The authority said a two per cent increase would off-set some of the cuts by providing the service with an extra £346,000.