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Rescue crews pulled a man out of the River Thames at Greenhithe this afternoon.
Two police cars, two ambulances and the air ambulance were at the Greenhithe Causeway following reports of someone found near the Pier Hotel.
Essex police said a white van had stopped on the Dartford bridge and motorists then saw a man fall into the water below.
Staff at the crossing then called emergency services at 1.50pm.
Gravesend RNLI were called and the body of a man, believed to be from east London, was pulled from the water.
Paramedics attempted to resuscitate him but he was pronounced dead at the scene.
The body was taken away by ambulance just after 3pm today.