Bullying at school is thought to be the motive behind this week’s fatal shooting of a 12-year-old boy at a Finnish primary school, police in the city of Vantaa told a press conference on Wednesday. The suspect, also 12, had revealed under questioning that he had been subjected to bullying at the school, they said. The suspect transferred at the beginning of the year to the sixth class of the school, also attended by the three victims. Two other 12-year-olds were injured. The incident took place on Tuesday morning. One pupil died at the scene. Two others are critically injured in hospital. Poli…