The police have initiated a preliminary investigation.
I will not be able to go into specific details, but our goal is to be able to return to normal as soon as possible, says Hellgren.
The schools, all located in the same area and sharing schoolyards, decided on the closure after the police informed them of a suspected impending violent act.
It is our responsibility as employers and those responsible for the school to ensure that both students and staff have a safe working environment at our schools, says school principal Elisabeth Burman at the press conference.
No suspect has been detained. Otherwise, the police are tight-lipped about the matter, but are working intensively with the investigation.
The information was sent out to affected guardians at 05:30 on Thursday.
We couldn't wait for more information and were forced to close the school and take the safe option, says David Helsing, safety officer at Ludvika municipality to TT.
In the morning, the municipality's security coordinator Johan Leopoldsson was on site at the schools along with school staff.
What we're doing now is catching up with individuals who haven't received the message that the school is closed. Then it's about trying to get more information from the police and making a decision about what we'll do tomorrow, he said then.
It is still unclear whether the schools will remain closed on Friday as well. Other schools in Ludvika are open as usual.
