A masked man wielding a sword has killed a teacher and seriously wounded another along with two pupils at a school in Sweden.<br /><br /> Police say they responded to calls warning of an intruder with a sword on the premises at 10am this morning.<br /><br /> A person had been attacked near the cafeteria.<br /><br /> It happened at the Kronan school in Trollhattan, an industrial town just north of Gothenburg.<br /><br /> There are 400 pupils at the school, ranging in age from pre-school to high school.<br /><br /> Swedish Prime Minister Stefan Löfven is expected to visit the school this afternoon.<br /> <br /><br /> Outside the schoolattack #kronan via MrSvantesson <br />#trollhatten #Sweden pic.twitter.com/jjrxQzzT9S— -= AnonSweden =- (AnonswedenInfo) October 22, 2015<br /> <br /><br /> <br /><br /> Leit is a pupil at the school who witnessed the attack. “The man had a mask on, he told reporters. “At first we thought it was a joke because Halloween is coming up soon. One of my friends went to take a picture with him.Then we saw the man getting stabbed so we just ran..”