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."

A student at the education centre in central Sweden has recalled how she and others tried to help one of the victims of what would turn out to be the worst school shooting ever to happen in Sweden. "A guy next to me was shot in the shoulder.

About 10 people including the gunman have been killed at an adult education center in what Sweden’s prime minister called the country’s “worst mass shooting.”