Copenhagen Vestegn Police have arrested three people in connection with the non-fatal stabbing that took place at a school in the western suburb of Ishøj yesterday.
The three were questioned today in a preliminary hearing at the courthouse in Glostrup.
In yesterday's incident, twin brothers were stabbed during recess in the CPH West school courtyard just before lunch.
Eva Hofman-Bang, the head of CPH West, said today that the police had informed her that the stabbing was connected to personal disagreements between the parties.
The stabbing victims are 18-years-old and were described as having a "foreign background".