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LONDON, ENGLAND - JUNE 14:  Smoke rises from the building after a huge fire engulfed the 24 storey residential Grenfell Tower block in Latimer Road, West London in the early hours of this morning on June 14, 2017 in London, England.  The Mayor of London, Sadiq Khan, has declared the fire a major incident as more than 200 firefighters are still tackling the blaze while at least 50 people are receiving hospital treatment.  (Photo by Carl Court/Getty Images)
LONDON, ENGLAND - JUNE 14:  Smoke rises from the building after a huge fire engulfed the 24 storey residential Grenfell Tower block in Latimer Road, West London in the early hours of this morning on June 14, 2017 in London, England.  The Mayor of London, Sadiq Khan, has declared the fire a major incident as more than 200 firefighters are still tackling the blaze while at least 50 people are receiving hospital treatment.  (Photo by Carl Court/Getty Images)

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Shock over how quickly flames engulfed building

Questions are being raised about whether recent renovations to the Grenfell Tower exterior caused the fire to spread more quickly. CNN's Fred Pleitgen reports.

Shock over how quickly flames engulfed building

Questions are being raised about whether recent renovations to the Grenfell Tower exterior caused the fire to spread more quickly. CNN's Fred Pleitgen reports.