TAIPEI: A deadly fireball that ripped through a crowd of young people at a Taiwan water park in June was caused when stage lights, an investigation reportedly showed Friday, ignited colored powder. The cornstarch powder had been sprayed over the crowd of hundreds of partygoers at the Formosa Fun Coast water park. It exploded when it came into contact with the lights, whose surface temperatures reached more than 400 degrees Celsius, the Liberty Times reported, citing a fire department investigation. Eleven people were killed and hundreds were hospitalized, some with third-degree burns covering more than 90 percent of their bodies. Two months on, 42 of the victims are still in critical condition, according to the Ministry of Health and Welfare.