A man in his 20s has been arrested after police said he assaulted a train employee and threatened another person with a knife on a train in Ski. Police in the Eastern Police District received the report during the night to Saturday, with a conductor notifying authorities at 00:49. The suspect allegedly struck an employee in the face and then threatened another person with a knife. The man left the train at Ski station in Nordre Follo. After a patrol stopped and controlled the suspect, the conductor later recognized him. Police then searched nearby and found a knife in a trash bin that matched the description given at the scene. The suspect is in custody and is arrested for violence and threats with a knife.