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Emergency services could be seen combing a river in response to reports of someone in the water.
Firefighters, police, the RNLI and ambulance crews attended the incident by Rochester Bridge late last night.
A spokesman for Kent Fire and Rescue Service said: "Crews were called to Rochester Bridge to reports of a person in the river.
"Firefighters, alongside the Coastguard, Kent Police and RNLI conducted a thorough search, however no one was found in the water. South East Coast Ambulance also attended."
Emergency services were at the scene from 11.46pm yesterday and 2.02am today.
A spokesman for South East Coast Ambulance said: "We came clear from the scene when no person was found."
More as we have it.