The three arrested are 18-year-old male high school students. Two are being investigated for aggravated sexual assault and aggravated unlawful coercion, while the third is suspected of unlawful coercion and assault, according to documents from the district court.
In connection with the police operation on Thursday, two additional people were brought in for questioning as witnesses. They are not suspected of any crime, the Swedish Prosecution Authority says in a press release.
The suspected crimes are believed to have been committed at the school between October 1 and 3.
Prosecutor and head of the preliminary investigation Lisa Dos Santos says the suspected crimes are serious.
"Intensive investigative work is now underway, including several interrogations," Dos Santos said in a press release.
“Angry and sad”
The school management does not want to comment directly on the suspicions, but refers to a press release.
"This is extremely serious. It makes me both angry and sad. Today we need to focus on our students. We are keeping the school open and running as usual and are available to the students right now," school principal Sofia Kinberg said in the press release.
In an email to guardians seen by Expressen, the school principal announced that "students are suspended from school." It is not clear how many are involved.
The police operation began at 3 p.m. on Thursday at Sigtuna School's humanities program, which has both boarding students and students who do not live at the school.
The police worked for several hours before leaving the school at 8:30 p.m. There was never any danger to the public. The police were tight-lipped about what had happened on Thursday evening.
Sent out emails
The suspected crimes took place in one of the school's dormitories, where boys aged 14 to 18 live, according to information provided to TV4 Nyheterna.
Guardians were informed by the school in an email that was shared with Expressen, among others.
"We would like to inform you that it has come to our attention that serious incidents have occurred at SSHL. The incident has been reported to the police, and during the evening the police were on site and began their investigation," the dispatch read, according to the newspaper.
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