London tower block fire: What went wrong at Grenfell Tower?

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Published on 15 Jun 2017, 6:22
Investigators are trying to establish how a fire in a London tower block was able to spread so aggressively and so fast.

A renovation of the building was completed in 2016. Cosmetic cladding was added to the outside, with some experts suggesting it could have acted as an accelerant.

Sky's Tom Cheshire reports on what went wrong.

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