Five people have been shot at an adult education centre in Sweden, according to police.
A major police operation is currently under way at the school, called Campus Risbergska, in the town of Orebro, around 200km (125 miles) west of the capital Stockholm.
Police urged the public to stay away from the school.
“This is currently seen as attempted murder, arson and aggravated weapons offence,” the force said.
Five people were taken to hospital. Four underwent surgery and two are critically injured, two are stable and one is lightly injured, police said at a press conference.
The male suspect is among the wounded, the force said.
A spokesperson said they could not rule out further perpetrators.
Officers were searching the school premises and could not say if anyone had been killed.
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Swedish newspaper Dagens Nyheter said police officers had been shot at, but police said no officers had been shot.
The school is for students over the age of 20, according to its website. It offers primary and upper secondary school courses, as well as Swedish classes for immigrants, vocational training and programmes for people with intellectual disabilities.
Students were taking shelter in nearby buildings and other parts of the adult education centre have been evacuated.
One person who was among those forced to barricade themselves inside the school said they “heard three bangs and loud screams”.
“Now we’re sitting here waiting to be evacuated from the school. The information we have received is that we should sit and wait,” they told Expressen newspaper.
Swedish newspaper Aftonbladet reported one person trapped in the school saying “we have heard several shots outside”.
The newspaper also quoted a person who had received a text from a teacher at the school saying “there was a shooting with automatic weapons”.
It said local emergency and intensive care departments are being made ready for casualties.
“The reports of violence in Orebro are very serious. The police are on site and the operation is in full swing,” Justice Minister Gunnar Strommer told news agency TT. “The government is in close contact with the police, and is closely following developments.”
Fatal attacks at schools in Sweden are rare, with 10 killed in seven incidents between 2010 and 2022, according to the Swedish National Council for Crime Prevention.
This breaking news story is being updated and more details will be published shortly.