The shooter targeted a center that serves migrants seeking to integrate into a country that had already reversed its liberal migration policies.

Witnesses of Sweden’s worst mass shooting described horror and panic that gripped an adult education center west of Stockholm as the gunman killed at least 10 people. He also died, although it's not yet clear how.

Sweden's prime minister said Tuesday a shooting at an education centre in the central city of Orebro, which left around 10 people dead including the suspected gunman, was the "worst mass shooting" in the country's history.