http://www.allehanda.se/angermanland/harnosand/hemmagjord-bomb-exploderade-pa-gymnasiet (In swedish) I translate to english for you. It is pretty funny with the thing about the homemade clock last week. "A homemade bomb exploded on Tuesday morning at Härnösands high school. No one was hurt in the blast, but many have experienced great discomfort, according to police. It was at 09:45 as teaching at the high school was disrupted by a loud bang that was heard even in the immediate area. The bomb had been fired in the schoolyard, and both staff and students were afraid. It was later proved to be a powerful homemade bomb. The headmaster at the school contacted the police, but also began its own investigation. Two of the students at the school were suspected to be behind the act. - They are now suspected for carelessness endangering the public , says Jan Aller at the police."