One person has been lightly injured in an explosion outside the Danish Tax Agency's office in Copenhagen in what police say was a deliberate attack.
The blast, which occurred at around 10:15am on Wednesday, shattered glass doors and windows and scorched metal cladding at the main entrance of the building in Nordhavn, just north of the city centre.
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Police closed off the surrounding streets and staff had been told to stay away.
"Someone did this on purpose. It was not an accident," Chief Police Inspector Jorgen Bergen Skov said at a news conference.
"We take this very seriously and already last night established a broad and comprehensive investigation. We cannot and will not accept an attack like this," he said.
It was too early to say who was responsible for the explosion, he added.
The tax agency was hit by an explosion 16 years ago to the day in what police at the time described as "vandalism", but on Wednesday Skov said their investigation had shown the two events were not connected.
Serious attacks or violence are rare in the small Nordic country of 5.7 million people that prides itself on its reputation for safety and social tolerance.
"This is an outrageous and totally unacceptable act," the Danish tax minister, Morten Bodskov, said on Twitter after inspecting what he described as "severe damages to the tax agency's building".