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A bus with Spanish license plates and containing gas bottles was found near a concert hall where earlier on Wednesday a rock concert was canceled due to a threat, Rotterdam's mayor said.
Ahmed Aboutaleb told a news conference it was not clear whether the threat at the concert for California band Allah-Las and the bus were connected. The bus driver was taken into police custody for questioning, he said.
"The ring that the police set up around the (concert hall) led to the detention of a bus with gas bottles", Aboutaleb said.
"Whether the bus with gas bottles can be linked to the threat, that cannot now be established."
Police reportedly received a tip-off from their Spanish counterparts. Source: 7 News
He warned against "swift conclusions". A bomb squad was examining the bus.
Police said the concert, which was to feature Californian band Allah-Las, was canceled around 7 p.m. local time, shortly before doors were to be opened for guests, after a tip from Spanish police.
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As concert-goers were sent away from the Maassilo, a former grain silo complex on the Maas river that has been converted into an event hall, the venue was cordoned off.
No arrests or detentions were reported until the bus driver was detained around 9 pm local time.
The National Coordinator for Security and Counterterrorism's office said the threat level in the Netherlands was unchanged at "substantial", where it has been for several years.
Rock band Allah-Las (pictured) were due to play the concert. Source: AAP