Asked to leave, gunman opens fire in bar in Oslo, Norway

Four men were shot and injured at a nightclub in Oslo at around midnight on Sunday, police said, adding that one suspect has been arrested. The Blue nightclub, where the shooting took place, is in an old industrial building.

The incident wasn't thought to be terror related. "The reason for the incident appears to be that the perpetrator was asked to leave the bar," the police said. The victims were taken to hospital and did not have serious injuries, said Grete Metlid, police inspector.