The police confirm that there are a number of patrols at the Teknikum high school in Växjö.
According to information to the newspaper Aftonbladet, a masked person armed with a knife should be in the school's area.
- We have an ongoing effort at Teknikum, but I cannot go into detail what it is about, says Per Bergendahl, who is on duty investigative leader at the police in Växjö.
According to a witness with whom SVT Nyheter has been in contact, four police patrols, three ambulances and two cars from the rescue service are in place.
Initially, there is no information that any person should have been injured.