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STOCKHOLM (Reuters) - A man has been arrested in Sweden on suspicion of terrorism-related crimes after an explosion on Thursday at a school in the south of the country, police said.

Police said they were investigating what caused the blast at the high school in Hassleholm. No injuries were reported and a man in his 20s was arrested at the scene.

“We are pretty sure this was a deliberate act,” police spokeswoman Kim Hild said, adding that additional information meant a terrorist offense could not be ruled out.