At least 10 people, including the gunman, were killed Tuesday at an adult education center in what Sweden’s prime minister called the country’s worst mass shooting. But a final death toll, a conclusive number of wounded and a motive hadn’t yet been determined hours later.

A shooting at a school for adults in Örebro, Sweden killed “around 10 people,” police said, marking it the worst mass shooting in the country’s history. The suspected shooter is believed to be among those dead.