A Thessaloniki high school teachers’ association yesterday sought the expulsion of seven pupils after a group of schoolchildren locked 31 teachers and the school principal in a classroom for two hours. The schoolchildren locked the teachers in the classroom to protest a decision to expel two pupils and temporarily suspend another two alleged to have cursed the school principal after she forbade them from sticking up posters on school walls. Although the two pupils who faced expulsion reportedly met with regional education officials and accepted their expulsion, their classmates decided to protest the move. After locking the teachers and principal in the classroom, the pupils staged a sit-down protest in the schoolyard. The pupils released the teachers after they threatened to take legal action against them.