Story highlights Police spokeswoman says authorities are looking at possible links to right-wing groups 
 
 Attacker, shot by police, dies at hospital 
 
 A teacher and student were killed; another student and another teacher were injured 
 
 (CNN) A masked man wielding a sword or a knife killed a teacher and a student in an attack Thursday at a school in Trollhattan, Sweden, before police fatally shot him, authorities said.  21-year-old suspect confirmed dead 
 
 Teenage student and teacher dead and another pupil and teacher being treated in hospital 
 
 'If I had not run, I would have been murdered,' student tells The Local 
 
 PM Stefan Löfven: 'A dark day for Sweden' The attack took place on Thursday morning at the school, around 75km from Gothenburg, after a man wearing a mask walked into a building on the premises wielding "several knife-like objects", police said. The injured were reported to be in serious condition at the hospital in Trollhattan, hospital officials said. The attacker had gunshot wounds to his lower chest and died later Thursday at the hospital, officials said. "The assailant knocked on two classroom doors and he attacked the two students who opened the doors," police investigator Thord Haraldsson told a press conference in Trollhättan. Her friends thought it was a joke and wanted to be photographed with the man, so Sara took a photo, Aftonbladet reports. Sweden's Prime Minister Stefan Lofven has arrived in the town, and said it was a "black day for Sweden". "My thoughts go out to the victims and their families, the students and staff, and the whole community that has been affected," Lofven said. There are no words to describe what they are going through right now."
– A teacher and a student were killed and another student and teacher were seriously injured in a sword attack at a school in the Swedish town of Trollhattan on Thursday, before the assailant was shot by police and taken to a hospital. Police say a masked man in his 20s used "several knife-like objects" as weapons in the cafe area of the Kronan school around 10am, per the Local and CNN. Two boys, 11 and 15, suffered serious stab wounds; one of them died later in the hospital, while the teacher died at the scene, per the BBC. A hospital rep adds the attacker "is seriously injured and is being operated on." The scene outside the school is still chaotic, where "parents are running around to find their children," says a witness. "I can't understand why it happened here." A student tells the Local, "I was in a classroom with my class when one of my classmates' sisters called her to warn her that there was a murderer at the school." He says he and a few others left the classroom to warn their teacher, who was in the hallway. "Then I saw the murderer, he was wearing a mask and had a sword. Our teacher got stabbed," he says. "The murderer started chasing me, I ran into another classroom. If I had not run, I would have been murdered." Earlier in the day, the school held a meeting based on teachers' concerns that anyone could gain access to the school through the entrance to the cafe, which is reportedly attached to the school and is meant for adults, per CBS News. There are about 400 students at the school, aged 6 to 15.