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A knife-wielding masked man attacked people Thursday at a school in southern Sweden, killing one teacher and wounding two students and another teacher before being shot by police, authorities said, according to The Associated Press.

Students fled in the morning from the Kronan school in Trollhattan, near Goteborg, Sweden's second-largest city. Police in Trollhattan, in a statement, said the attack took place in the school's cafe area.

Police arrived at the school to find one male teacher already dead and two students and another male teacher wounded, police spokesman Thomas Fuxborg told The Associated Press.

Another police spokesman, Stefan Gustavsson, told the AP the attacker had a large knife, possibly two, including what may have been a sword. He said authorities knew the attacker had killed the teacher "because of the wounds he had."

Fuxborg said police fired two shots, one of which hit the attacker, a man in his 20s.

Police did not give any possible reason for the attack.

Health authorities in Trollhattan said the two students, aged 11 and 15, were seriously wounded with cuts. They said the attacker was also in serious condition. There was no immediate information on the condition of the wounded male teacher.