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."

Eleven people are dead after a rampaging gunman opened fire at an adult education centre in central Sweden, in what has been dubbed the country’s worst ever mass shooting.Armed police were scrambled to Risbergska School,

Around 10 people were killed in a shooting at an adult education centre on Tuesday, Swedish police said, marking the country’s deadliest gun attack in what the prime minister called a “painful day.”