Prime Minister Ulf Kristersson will hold a news conference at 7:30 p.m. local time (1830 GMT) alongside Justice Minister Gunnar Strömmer,
Earlier, Kristersson said that it was “a very painful day for all of Sweden,” Swedish media reported.
“My thoughts are also with all those whose normal school day was exchanged for terror,” Kristersson said. “Being confined to a classroom with fear for your own life is a nightmare that no one should have to experience.”
Swedish King Carl XVI Gustaf praised police and the rescue and medical personnel who responded to the shooting, and issued words of comfort to the families of the victims.
“It is with sadness and dismay that my family and I have received the information about the terrible atrocity in Örebro,” the monarch said in a statement. “We send our condolences tonight to the families and friends of the deceased. Our thoughts at this time also go to the injured and their relatives, as well as to others affected.”
The shooting erupted after many students had gone home following a national exam. Police vehicles and ambulances, lights flashing, blanketed the parking lots and streets around the school as a helicopter buzzed overhead.
Teacher Lena Warenmark told SVT News that there were unusually few students on the campus Tuesday afternoon after the exam. She also told the broadcaster that she heard probably 10 gunshots.
Students sheltered in nearby buildings. Other parts of the school were evacuated following the shooting, which began at around 12:30 p.m. local time (1130 GMT).
Andreas Sundling, 28, was among those forced to barricade themselves inside the school.
“We heard three bangs and loud screams,” he told Expressen newspaper while sheltering in a classroom.