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The explosion was caused by a hand grenade according to local news reports.

The police have released a statement to say they were called by several people due to a loud bang.

Police spokeswoman Anna Goransson said to the Swedish tabloid Aftonbladet: “The place is locked off and the bombing group is on its way.

"Fortunately, no people have been injured, but cars, I cannot say how many, have been damaged."