Slipknot’s concert in Phoenix, Arizona, was cut short after fans started an enormous bonfire in the middle of the show. The exact cause of the fire hasn’t been determined yet, but fans seemed to enjoy it until they had to wait for thirty minutes to get the fire under control.

For those of you who may not know, Slipknot has been preparing for their annual festival, Knotfest, which was first organized in 2012. During this year’s festival that will take place at the Banc of California Stadium, the band will be performing its biggest headlining concert to this date.

The event will also include other bands and artists, such as Bring Me To The Horizon, Killswitch Engage, Fever 333, Code Orange, Taylor’s son’s band Vended, and his wife’s dancing group Cherry Bombs.

Three days before the actual festival, Slipknot performed at Phoenix, Arizona, as part of their Knotfest Roadshow. What first started as a regular concert later turned into a disaster when fans started a bonfire at the back of the crowd.

Just before the fire was started, fans celebrated guitarist Mick Thomson’s 48th birthday. Following the ‘Happy Birthday’ song, a massive fire was spotted on the lawn of the outdoor amphitheater.

The fire seemed to shoot up to 30 feet in the air as the band was performing their song ‘All Out Life,’ nearing the end of their set. Unfortunately, they had to delay their show while the crew put the fire out. Therefore, Slipknot’s set was cut short, and the band was forced to skip two of their songs, ‘Duality’ and ‘Spit It Out.’

While a possible catastrophe was prevented, fan footage on Twitter showed that the crowd was having fun around the bonfire as Slipknot was performing on stage. The pictures from fans that were shared on social media reflected what a horrible scene it was from afar as well.

You can see a fan tweet showing the fire below.