Dutch police on Monday arrested the driver of a delivery van that hit pedestrians near a campsite at a huge music festival in the Netherlands, killing one and injuring three, a statement said. "The police found the white van that was involved in the incident and a suspect has been detained," it said. No further details were provided. Officers said it was not clear whether the van driver had hit the group of four pedestrians at the Pinkpop event intentionally or by accident. "This investigation is still underway and we cannot say whether this was something intentional or an accident," said police spokesman Hub Haenen. A police statement said the street where the incident took place, one of two exits from the concert grounds, had been closed for forensic investigation. The Pinkpop festival was launched in 1970. This year as well as R&B artist Bruno Mars, who closed the event on Sunday, other major bands including Pearl Jam, Foo Fighters, Snow Patrol and Noel Gallagher performed to sell-out crowds. The festival has drawn around 67,000 fans a day since opening on Friday, according to director, Jan Smeets, quoted by the Dutch news agency ANP. The organization said in a statement on Facebook that it was "shocked, and our thoughts are with victims and their families."