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

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. SUBSCRIBE to our YouTube channel for more videos:    / skynews   Follow us on Twitter:   / skynews   and   / skynewsbreak   Like us on Facebook:   / skynews   For more content go to http://news.sky.com and download our apps: iPad https://itunes.apple.com/gb/app/Sky-N... iPhone https://itunes.apple.com/gb/app/sky-n... Android https://play.google.com/store/apps/de...