Officials in Sweden have vowed to determine why a man killed 10 people, and apparently himself, in an unprecedented attack that's shaken their "society to its core."

Police have confirmed that 11 people have now died following a mass shooting at an adult education school in Sweden and the number of injured is currently unclear.

Scene in Orebro after Sweden’s worst mass shooting leaves at least 10 dead Live from Orebro after Sweden’s worst mass shooting left least 11 people dead, including the gunman, and at least five seriously wounded at an adult education.