A minor opened fire Tuesday at a school in Vantaa outside the Finnish capital Helsinki injuring three others, police said, adding that the attacker was in custody.
The school has around 800 pupils and 90 staff.
Police were alerted to the scene and later specified that both the suspect and the injured were all minors.
The city of Vantaa's crisis group was activated following the shooting, local media reported.
Police urged the public to stay away from the area and remain indoors.
