The death toll at the Pukkelpop music festival in Belgium, hit by a sudden violent storm, has now risen to five, say local officials.
Staging collapsed, giant screens fell, tents were flattened and trees were uprooted in the space of minutes after the storm struck.
Dozens more people were hurt, several seriously.
Belgian Prime Minister Yves Leterme has sent his condolences to the families of the victims.
Reports say organisers have now decided to cancel the rest of the event.
"During the night, the fifth festival-goer died in hospital. I think that the organisation of Pukkelpop rightly took the courageous decision to stop the festival," Hasselt mayor Hilde Claes was quoted as saying on the website of De Standaard newspaper.
'End of the world'
About 60,000 people were believed to be at the event, one of Europe's largest outdoor festivals, when the storm hit. Headline acts this year were set to include Eminem, Foo Fighters and the Ting Tings.
"The sky suddenly turned pitch black and we took shelter waiting for the rain," said festival-goer Catherine Blaise, according to Le Soir newspaper.
"Then suddenly, there was a downpour. The wind blew violently. There were hailstones bigger than a centimetre falling... Trees toppled over.
"It was unbelievable, the end of the world," she said.
Within 10 minutes, the storm had turned the festival site into a scene of mud and destruction, reports said.
More than 20 ambulances raced to and from the site near Hasselt, some 50 miles (80km) east of Brussels. More-lightly injured people were being treated at a local sports complex.
Many festival-goers were inside tents which collapsed when the storm hit.
"It was mass panic," Laura Elegeert, 17, told AP news agency.
"People were trying to get out of this tent that collapsed by using their pocket knives and cutting holes in the fabric."
Two cranes were brought in to try to lift the largest tent late on Thursday - which collapsed as the band Smith Westerns was playing - but the festival grounds appeared to be too swamped to allow them access, AP said.
It was the second consecutive year of tragedy for Pukkelpop. Last year, lead singer of the group Ou Est Le Swimming Pool, Charles Haddon, committed suicide at the event.
Five people were killed last week at a festival in the US state of Indiana, when a stage collapsed in high winds.
It's always hate it when a day that should be fun ends in such tragedy.
I heard some footage of the storm on the radio, it even managed to sound utterly awful so I can't imagine what it must've been like to actually be there. Apparently bad weather had been forecast but the terrain was hit by a freak storm surge. Hailstones big enough to give people bruises, insane winds... Yeah, horrible.
All but one of the people I know at the festival have been accounted for. Physically they're fine but I doubt they'll be forgetting what happened there any time soon.
