Around a hundred teachers are staging a demonstration inside Nottingham City Council offices against planned changes to the school year.
The members of the National Union of Teachers (NUT) are on strike today in protest at moves to introduce a five-term year.
The rally began outside but the demonstrators have entered the building and are demanding that someone from the council talks to them.
The NUT claims the term changes will be disruptive. The council says they would improve pupils' achievement and attendance.
Councillors in Nottinghamshire are today expected to approve changes to the school year.
Teachers in Nottingham are on strike for the third time in less than a month over plans to introduce a five-term year.
Teachers in Nottingham are threatening to intensify their strike action over changes to the school year.