Sweden’s worst mass shooting has left at least 11 people dead, including the gunman, at an adult education center as officials warned that the death toll could rise.

Swedish police confirm around 10 people were killed at a school for adults on the outskirts of Stockholm. The gunman is believed to be among the dead.

Sweden's worst mass shooting has left 11 dead, including the gunman, and five seriously injured at an adult education center near Orebro. Authorities are investigating the motive as officials and royal figures respond to the national tragedy by mourning and attending memorial services.