Oslo, March 19 (IANS) Four staff members were injured on Tuesday when a student attacked them with a knife in a school in the Norwegian capital Oslo, police said.

The student was arrested but the motive was not immediately clear, The Independent daily reported.

The four victims, all employees at Brynseng School, were taken to hospital with minor injuries.

An Oslo Police official described the suspect as "very young". He said an investigation had been launched.

--IANS ksk/mr