Norwegian police said on Monday they had arrested a suspected shooter after receiving reports of gunfire at Oslo's largest shopping centre.
Police said in a statement that no injured people had been found and that it was safe to reopen the centre again, after it was earlier evacuated.
"As of now, it appears that there was only one perpetrator involved," the statement said.
Police spokesperson Tomm Berger told journalists the suspect, a 19 year-old, had called the police before he fired a single shot with a shotgun into the ceiling. The suspect had also been carrying a baseball bat and a knife.

Israeli strikes kill 26 in Gaza, health officials say
US government starts likely brief shutdown as House fails to approve deal
Thousands demonstrate in Minnesota and across US to protest ICE
France tightens infant milk rules after recalls
Modi ally proposes social media ban for India's teens as global debate grows
Indonesia landslide death toll rises to 49, agency says
Syrian government, Kurdish-led SDF agree integration deal
Trump warns Britain on China ties as Starmer hails progress in Beijing
