A huge fire forced the evacuation of some 20-thousand fans at a music festival in Barcelona, Spain.

The spectacular blaze sent flames towering above the “Tomorrowland” electronic music festival as it gutted the outdoor stage in the city’s Parc de Can Zam Saturday night.

20 people were treated for minor injuries by concert security staff, and fire officials say there were no serious injuries during the evacuation.

The “Tomorrowland” website says the fire was caused by a “technical malfunction.”

The Barcelona festival was cancelled following the fire.  It’s one of several events that are offshoots of the main “Tomorrowland” festival in Belgium.