The 17-year-old sustained fatal head injuries while he attempted to light the fuse, which malfunctioned and exploded at a party in Eberschwang in Upper Austria.
Watch: Aerial firing, fireworks by police in Karachi
Police said they have launched an investigation to determine the origin of the device, which may not have been obtained legally.
Across Austria, around a dozen people were wounded in firework-related mishaps, according to officials.
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