Fans roared in excitement and organizers sighed with relief as the Tomorrowland music festival kicked off Friday — two days after a massive fire engulfed the main stage and threw one of Europe's biggest summer concert events into doubt.

A fire severely damaged the main stage of one of the most famous EDM music festivals in the world. Here's what to know about Tomorrowland.

The cause of the fire remains unknown. No injuries were reported in the incident, according to festival organizers.