AN explosion has rocked central Oslo on Tuesday after cops detonated a grenade and arrested a man.
Norwegian police are investigating a blast in central Oslo on Tuesday evening.
Police are investigating an explosion on Tuesday night in Oslo
Authorities have warned the public to stay away from the site.
The first reports of explosions came in at 9pm.
A police spokesperson told Norwegian media they carried out a controlled detonation of a grenade.
Witnesses of the explosion say they also saw drones flying over the area.
The situation remains unclear
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