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.

Two others -- another teacher and student -- were wounded in the attack on the Kronan primary and middle school. The injured were reported to be in serious condition at the hospital in Trollhattan, hospital officials said.

"This is a dark day for Sweden," Prime Minister Stefan Lofven said. "My thoughts go out to the victims and their families, pupils and staff, and the entire community that has been affected. There are no words to describe what they are going through right now."

Law enforcement officials said police shot the suspect at the scene and he died later at the hospital.

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