Most were caused Causation by sparks from powerlines downed Motion_directional by the wind .

On the `` Mont-Blanc '' , the impact Influence damaged Damaging benzol barrels stored on deck , leaking Motion vapors which were ignited Process_start by sparks from the collision Catastrophe , setting off a fire Catastrophe on board that quickly grew out of control .

The fire started Process_start when sparks from pyrotechnics ignited the low ceiling and its willow twig covering .

A preliminary finding by investigators concluded Coming_to_believe that sparks from welding work being done on the building , undertaken by unlicensed welders , ignited scaffolding around the structure , which led to Causation the apartments ' destruction Destroying .