ROTTERDAM, Netherlands — An explosion at the Dutch port of Rotterdam on Thursday killed at least one person and injured several others, city police said.

Police said the blast at Europe’s biggest port happened late Thursday morning and that a crime scene has been set up to try to establish what caused it. In a post on social media, they said the explosion “appears to be a workplace accident for the time being,” without elaborating.

At the scene, Rotterdam police spokesperson Daan Valkenburg told The Associated Press that no definitive conclusions had been drawn and that “we are keeping all possibilities open.”

The explosion occurred at a refinery and fuel terminal operated by Gunvor Energy in an industrial section of the sprawling port. Dutch broadcaster NOS said that a maintenance team had been working on a section of pipes there.

Rotterdam's emergency services coordinator also reported a major power failure in another part of the port and said that a transformer had caught fire under unexplained circumstances. Several companies halted their operations and evacuated workers.

By mid-afternoon, power was fully restored to the area, where a number of oil and gas companies are based. Emergency services later ruled out any link between the blackout and the explosion.

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