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.”

School attacks are relatively rare in Sweden, but the country has suffered shootings and bombings linked to gang violence that kill dozens of people each year.

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.

OREBRO, Sweden (Reuters) -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.