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.
On its last legs, the MiG-21 continues to bare its fangs. The most advanced aircraft that the Pakistan Air Force flaunts went down to the oldest fighter in IAF inventory, the venerable MiG-21, in an aerial duel in the skies of Jammu and Kashmir today.
Nobel Peace Prize winner Malala Yousafzai on Thursday urged the prime ministers of India and Pakistan to engage in dialogue to settle the current conflict and long-standing issue of Kashmir.
Pakistan Prime Minister Imran Khan on Thursday said that as a peace gesture they would be releasing Indian Air Force pilot Wing Commander Abhinandan on Friday.
"It is telling that no country has spoken out in Pakistan's favour after the Indian air strike," Husain Haqqani, the former Pakistani Ambassador to the US, said.
India-Pakistan tensions persisted on Wednesday as the IAF chased away intruding Pakistani fighter jets in Jammu and Kashmir's Nowshera sector with India shooting down a Pakistani F-16 which fell on the Pakistani side.
Pakistan Prime Minister Imran Khan on Wednesday offered talks to India and urged that "better sense should prevail" as tensions spiked between the two nuclear-armed neighbours following an aerial engagement between their air forces.