People watching the film shooting at first thought it was a movie special effect
special effect (noun)
Meaning: something special and xciting added to a movie such as an explosion using some extra technology
Thai Translation: เทคนิคพิเศษ
Learn more
and not a real fire, but after they saw people running around with fire extinguishers it became apparent that it was a real fire. The fire spread fast and people in the building ran out and shouted for help.