More than 2,100 teachers from the Tokyo Metropolitan High School Teachers' Union staged a one-hour strike Friday to protest the metropolitan government's decision to give more authority to school principals.

A total of 2,171 union members from 105 public high schools left their classrooms Friday morning to protest the metropolitan Board of Education's decision on Thursday to revise school administration policies to give principals more authority than teachers' panels.

Some schools currently give more decision power to teachers' panels than to principals. The board also revised the policy to authorize itself, and not school principals, to appoint head teachers.

According to Takayoshi Migishima of the metropolitan government, the strike did not affect many students, because 101 of the 105 schools were in after-exam recess Friday.