Recent news reports are that skyscrapers built in Dubai prior to 2012 do not have exteriors that are "fire rated," i.e., the exterior building cladding is flammable, allowing the fire to climb up the exterior of the building. As one article explains:

"At the heart of safety concerns is the use of polyurethane and aluminium composite cladding on buildings throughout the height of the emirate’s building boom. The material was only outlawed by new regulations in 2013." See: http://news.nationalpost.com/news/emirates-skyscrapers-are-killers-in-waiting-says-fire-expert (my underlining in quote).

Note that polyurethane is flammable.