A pupil has injured a teacher and three other staff members with a knife and fork taken from a school kitchen in the Norwegian capital Oslo, police said.

The boy – who studied at the school – was arrested after reports he attacked staff with a knife. The motive was not immediately clear.

Police later confirmed the victims suffered bite marks and had been stabbed with a knife and fork taken from the canteen.

We’ll tell you what’s true. You can form your own view. From 15p €0.18 $0.18 USD 0.27 a day, more exclusives, analysis and extras.

Four 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.

“It is a very young boy who is arrested. I can’t say anything more about the grade level. He was arrested inside the school,” he said.

Shape Created with Sketch. World news in pictures Show all 50 left Created with Sketch. right Created with Sketch. Shape Created with Sketch. World news in pictures 1/50 18 March 2019 Emergency services stand at the 24 Oktoberplace in Utrecht where a shooting took place. Several people were wounded on a tram in the Dutch city of Utrecht, with local media reporting counter-terrorism police at the scene. "Shooting incident... Several injured people reported. Assistance started," the Utrecht police Twitter account said. "It is a shooting incident in a tram. Several trauma helicopters have been deployed to provide help." AFP/Getty 2/50 17 March 2019 Coffins of victims of the crashed accident of Ethiopian Airlines are gathered during the mass funeral at Holy Trinity Cathedral in Addis Ababa, Ethiopia. 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Police were first called at around 8.30am local time to reports of an ongoing incident with a student threatening a teacher with a knife.

A police statement said: “Four people were taken to the emergency care department for treatment.

“The injured are employees of the school. We are still on the site with several patrols and are conducting witness interrogation.”

Police confirmed pupils may have witnessed the incident but no children were harmed.

Armed police remained at the school throughout the morning.

The school, which opened in 2017 and has more than 800 pupils enrolled, gave no comment to Norwegian newspapers despite requests.

Local media quoted a text message sent by the headteacher, Maria Tindberg, informing parents that the situation was now ”calm and under control”.

A survey for Norway’s educational association last year found around one in five teachers had experienced violence over the previous 12 months.

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