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.
A Sikh taxi driver has been hailed as a hero for saving a 13-year-old school girl from a planned abduction by a paedophile armed with knives, tape and sleeping pills, a media report said.
The centre said since the water level in some of the major rivers, including Nilwala, Gin and Kalu, was rising due to the heavy rain people have been urged to move to higher ground.
The Obama administration had set targets that envisioned school reducing the amount of sodium in school meals each year.
Pope Francis also said it was "imperative" for world governments to immediately help the Bangladeshi government provide for the refugees.
The authorities warned tourists that they were likely to face long waits before returning home because of a huge backlog of flights.
The conference had been under discussion for weeks between Foreign Affairs Minister Chrystia Freeland and her U.S. counterpart, Secretary of State Rex Tillerson