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Why are London pavements exploding?

15 September 2014 Last updated at 21:43 BST

Two delivery van drivers had a lucky escape when a pavement exploded in central London in July.

The CCTV footage, released by Westminster City Council, showed the incident which happened near Piccadilly Circus.

Council officials are questioning energy bosses from Ofgem and the UK Power Network on Monday evening over the growing problem of pavement explosions across the capital.

Chris Rogers reports.