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."

The shooting occurred at a center for adult education in the city of Orebro. The suspect is believed to be among the dead, officials said.

The king and queen visited the scene of the tragic event that occurred on Tuesday and Swedish flags were flown at half-mast to honor the victims.

Sweden's worst mass shooting left at least 11 people dead, including the gunman, and at least five seriously wounded at an adult education center west of Stockholm. The gunman's motive hadn't been determined by early Wednesday as the Scandinavian nation — where gun violence at schools is very rare — reeled from an attack.

Swedish news outlets identified the shooter as Rickard Andersson, a 35-year-old from Orebro, the city where the shooting occurred, although the police have not publicly confirmed that.

The government said it specifically wanted to restrict access to semi-automatic weapons such as the AR-15, citing it as

Witnesses who survived Sweden’s worst mass shooting have described horror and panic that gripped an adult education center west of Stockholm as the gunman killed at least 10 people.

Storyline: Residents have been mourning for the victims of a mass shooting that took place at noon on Tuesday at Risbergska Skolan, an education center mainly for adults in Orebro in central Sweden. Investigators in Sweden are looking into whether the devastating incident was a targeted attack,

Eleven people — including the perpetrator — were killed in what Sweden's PM described as the worst mass shooting in the country's history. View on euronews

Sweden is reeling from the country's deadliest mass shooting this week as investigators continue to look into the gunman's motive.