Eleven people were killed in a shooting at the Risbergska School in Örebro, some 125 miles west of Stockholm, on Tuesday.Police said the gunman was believed to be among those killed and a search for other possible victims was continuing at the school.

Police said “around 10 people” were killed at a school on Tuesday, in what has been described as the worst mass shooting in Sweden’s history. The suspected perpetrator is among the dead.

Prime minister Ulf Kristersson on Tuesday said the attack was the worst mass shooting in Swedish history, calling it a “painful day”, while king Carl XVI Gustav conveyed his condolences. Police said the motive for the shooting at the Risbergska school in Örebro, some 200km (125 miles) west of Stockholm, was not immediately known.