(CNN) At least 472 people were injured — about 100 of them seriously — after flammable powder apparently exploded in midair at a recreational water park in Taiwan, the East Asian nation’s official Central News Agency reported.

The flames erupted when the unknown substance blew up over a stage around 8:30 p.m. Saturday (8:30 a.m. ET) at Formosa Fun Coast, firefighters said, according to the CNA report.

CNA reported that “the fire was quickly brought under control,” but not before hundreds suffered injuries.

Video showed a massive fireball suddenly engulfing the stage, followed by screaming people running for their lives through flames.

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