Two people were injured in an incident at a school in Malmo, southern Sweden.
As the police in the third largest city in the Scandinavian country announced on Monday evening, one person was arrested after the incident.
She assumed it was a lone perpetrator.
The school was cordoned off extensively.
In addition to a number of patrol cars, several ambulances were seen on site, with which the two injured were taken to the hospital.
It was initially unclear how serious her injuries were.
According to previous knowledge of the police, they were not high school students.
The police initially reported in the late afternoon that they were dealing with a suspected serious crime.
However, what exactly happened in the school in the center of the city remained unclear.
According to the broadcaster SVT, students were in the building late at night to prepare a musical.
The principal of the high school, who was in Gothenburg a good 250 kilometers further north at the time, told the Aftonbladet newspaper that all he knew was that "deadly violence" was going on in the school.
The police later reported that the situation was under control.
She spoke of around 50 people who were on the school grounds at the time of the crime.
Sweden has been dealing with rampant gang crime for a long time.
In the course of this, there are repeated shots and deliberately caused explosions in the large and sometimes also in smaller cities of the country.
Malmö has been aware of the problem of criminal gangs longer than other parts of the country and has taken several measures and programs to counteract it.
The Rosengård district of Malmö in particular – the home of the Swedish soccer star Zlatan Ibrahimovic – is considered a problem area.
It is still unclear whether the incident at the school has anything to do with the criminal milieu.