“I saw a man arrive at the site with a bag. He picked up a weapon and started shooting,” Roenneberg told NRK. “First I thought it was an air gun. Then the glass of the bar next door was shattered and I understood I had to run for cover.”

Norway experienced one of the worst mass shootings in Europe in 2011 when a right-wing extremist killed 69 people on the island of Utoya after setting off a bomb in Oslo that left eight dead.