Two people huddle against the wind and rain at the Pukkelpop festival in Belgium. (IMAGE VIA YOUTUBE)

At least one person was killed and 40 more injured, according to the Associated Press.

Just before the concert began, Smith Westerns singer Cullen Omori tweeted about the coming rain:

The rain at Pukkelpop was accompanied by hail and strong winds that toppled stage equipment, towers, a tent and a tree.

The festival was halted, and as many as 60,000 attendees have left the mud-filled grounds.

Watch video of the driving rain:

Stages collapsed this year at Ottawa Bluesfest, a Flaming Lips show in Oklahoma and at the Indiana State Fair.

Watch video of the Pukkelpop stage collapse below:

After the collapse, the festival retweeted this festivalgoer, who wrote: “I have never seen this.”