Sixty people have been injured as more than 130 vehicles were involved in a series of crashes in thick fog on the Sheppey crossing in Kent.
Eight of those hurt in the collisions, which took place in thick fog, sustained serious injuries.
Ambulance crews said 35 casualties needed hospital treatment in what were described as "horrendous scenes".
The A249 bridge was closed for more than nine hours and reopened to traffic at about 17:30.
One witness said visibility had been very poor at the time of the crash but drivers were approaching the crossing with no lights.
Others at the scene described a mass of tangled cars, lorries, and a car transporter. Some reports said the crash went on for 10 minutes as cars continuously collided with each other.
Eight of those hurt in the collisions, which took place in thick fog, sustained serious injuries.
Ambulance crews said 35 casualties needed hospital treatment in what were described as "horrendous scenes".
The A249 bridge was closed for more than nine hours and reopened to traffic at about 17:30.
One witness said visibility had been very poor at the time of the crash but drivers were approaching the crossing with no lights.
Others at the scene described a mass of tangled cars, lorries, and a car transporter. Some reports said the crash went on for 10 minutes as cars continuously collided with each other.
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