At least 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." But a final death toll, a conclusive number of wounded and a motive hadn't yet been determined hours later. Prime Minister Ulf Kristersson gave a news conference in Stockholm in the aftermath of Tuesday's tragedy on the outskirts of Orebro. The city is located about 200 kilometers or 125 miles west of Stockholm. The school serves students over age 20. Primary and upper secondary school courses are offered as well as Swedish classes for immigrants, vocational training and programs for people with intellectual disabilities.

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Police at the scene of an incident at Risbergska School, in Örebro, Sweden.