UPDATE 1-Pupil injures four staff at Oslo school - police

A pupil attacked several employees at a school in Oslo on Tuesday, injuring four people, police said.

The boy had threatened staff with a bread knife, although none of the injuries were from the knife, police told public broadcaster NRK. The four people were taken to hospital with minor injuries, police said on Twitter. (Reporting by Terje Solsvik; Editing by Andrew Heavens and Janet Lawrence)