Stunned witnesses told how they saw the walkway – thought to be for pedestrians – come down on top of lorries and other vehicles.At least one person is thought to be injured in the horror accident – which happened this afternoon as hundreds of families went away for the Bank Holiday.
One witness claimed a motorcyclist got his leg trapped in the accident – but there has yet to be any confirmation from police.According to reports the bridge collapsed between junctions 3 and 4 on the motorway – close to a turnoff for Sevenoaks in Kent.
Other footage appears to show one large lorry with the length of its trailer sheared off completely.
It is not yet clear how the bridge came crashing down, but other images show groups of people standing outside of their cars watching in disbelief.
Motorists are being warned to expect long delays on both sides of the motorway while emergency crews assess the situation.