What is the reason of fire in Torch Tower in Dubai?

Considering the building is called TORCH so how could you not expect someone to have that idea to do it LOL! If they sue the person who started it he can use the building name for his defense . Ha ha

Though on the smoking claim, I don't know why anyone would be smoking in the balcony of a 50th floor at 2 AM when it was so windy that night unless may be the guy tossed the cigaratte out the window and it caught on exterior of building. One rumor is that flames started with an unattended BBQ grill and with the strong wind the flames reached the walls.

GN article mentions firefighters saying:

(“Although the fire started on the 51st floor on the beach-facing part of the tower, the strong winds that day caused burning debris to fly off and start a fire on the other side of the building facing Shaikh Zayed Road,” he said.

Most of the firefighting was done internally, he explained, with teams outside the tower putting out any minor fires caused by the flying debris in nearby cars and the tram tracks. Teams were also evacuating nearby buildings.

Around a 100 firefighters took part in the operation.

“The fire was in the balconies and was moving into the apartments, but thanks to the building’s efficient fire system – which was working at a 100 per cent — the fire did not spread into the apartments, as once it did, the sprinklers would put it out,” he said.

The system, he said, helped cut down the efforts needed to put out the fire “by around 70 per cent. If it weren’t for the system, this fire would have been a disaster”.

...

“The cause of the fire is still under investigation but from my experience, I think the cause was that one of the tenants left was irresponsible and left a heat source unattended. But it will be clear once the police forensics report is ready,” Lt Col Bel Shallan said.)