An attacker has injured a teacher and three other staff members at a school in the Norwegian capital Oslo,
According to police reports, the attacker has been apprehended though the motive of the attack was not immediately clear.
The four victims, all employees at Brynseng School in the east of the city, were taken to hospital with minor injuries. Sven Christian Lie, of the Oslo police department, said an investigation had been launched and officers were speaking to witnesses.
Police were first called at around 8.30am local time and arrived less than 10 minutes later.