The Highways Agency says it has filled the hole in the M2 in Kent with 40 tonnes of shingle.
This, officials say, has stabilised the hole and is helping them assess the extent of the problem.
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With harmful pollutants at record levels the Mayor of London's campaign aims to highlight the impact air quality can have on health.
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Abdul Samad, 28, was stabbed outside his family home in Little Venice last night and died an hour later in hospital.