A gunman opened fire at an adult education center in the Swedish city of Örebro on Tuesday, killing at least 10 people in what the country’s prime minister called the “worst mass shooting in Swedish history.

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.

The worst mass shooting in Swedish history was carried out by a 35-year-old Swedish man who lived locally, had been unemployed for a decade and had changed his first and last name, a police source and tax data show.