At least 11 people, including the gunman, were killed in Sweden's deadliest mass shooting at Campus Risbergska, an adult education center in Orebro, west of Stockholm.

Axar.az, citing ABC news, reports that the shooting occurred Tuesday afternoon after many students had left following a national exam.

The motive remains unknown, and authorities have not confirmed the number of wounded. Police believe the attacker acted alone and was among the deceased. There’s no evidence linking the incident to terrorism. Prime Minister Ulf Kristersson called it “the worst mass shooting in Swedish history,” while investigations continue to uncover the motive and circumstances.