The suspected gunman in a deadly school shooting in Sweden shot himself after killing 10 people on Tuesday, police believe. Armed police exchanged fire with an unnamed shooter at Risbergska School in Örebro, 125 miles west of Stockholm, in what Swedish prime minister Ulf Kristersson has described as the worst mass shooting in the country’s history.

Swedish police are investigating for a motive after a school shooting in the city of Örebro that has killed at least 10 people. NBC News’ Matt Bradley reports on what is known about the shooting.

Sweden’s prime minister said the attack at the Risbergska School was the worst mass shooting in country’s history