The Tomorrowland Unite Spain festival is currently underway in Barcelona.
Around 22,000 people had to be evacuated from the festival after a fire broke out on the main stage.
According to Spanish newspaper El Pais, the blaze apparently broke out after a pyrotechnic element malfunctioned.
No injuries have been reported so far.
Fans have been posting footage of the blaze online.
UNITE stage went up in flames.— Ravindu Thimantha G. (@IamRavindu)
Footage of the fire spreading at Unite in Spain. Looks terrible!— We Rave You (@weraveyou)
first minutes of fire in Spain— Adrian Herrera (@_adrian_herrera)
DJ Steve Aoki had been due to perform on the stage at the event when the fire began.