The mayor of Rotterdam said police have detained the driver of the bus, which has Spanish license plates, after receiving a terror warning from police in Spain.
He said that police and prosecutors had taken the threat against the concert seriously and it would now take time to investigate. Allegedly, canisters were found on a tip-off by Spanish police.
Police said the concert, which was to feature Californian band Allah-Las, was cancelled at around 7 p.m., shortly before doors were to be opened for guests, after a tip from Spanish police. Aboutaleb said it was not clear if the van and the threat were linked.
Fifteen people were killed and 120 others were wounded in the attacks which took place on Barcelona's Las Ramblas district and in the coastal town of Cambrils. They later found bomb-making equipment that included more than 100 tanks of butane gas and nails. The bus driver was taken into police custody for questioning, he said.
Concert organizer Rotown said earlier on Twitter that the concert venue, a former grain silo called Maassilo, was being evacuated because of the unspecified threat.
The decision to call off the show was made at around 7pm local time (6pm United Kingdom time), shortly before doors opened at the Maasilo concert hall.
The band is a four-piece from Los Angeles.
The Allah-Lahs, a four-piece band, told the Guardian newspaper previous year that they wanted a "holy sounding" name for their group and didn't think it would offend Muslims.
"We get emails from Muslims, here in the USA and around the world, saying they're offended, but that absolutely wasn't our intention", guitarist and vocalist Miles Michaud told the newspaper. "We email back and explain why we chose the name, and mainly they understand".
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