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."

At least 11 dead, including suspect, in 'worst mass shooting' in country's history - Police say the suspect in the shooting at Risbergska School in Örebro is among those who died

Sweden's worst mass shooting left at least 11 people dead, including the gunman, at an adult education center west of Stockholm as officials warned the death toll could rise.

Sweden's right-wing government said on Friday it would seek to tighten gun laws in the wake of the country's deadliest mass shooting at an adult education centre where the attacker appeared to have used several of his own licensed rifles.