Police have fired tear gas at protesters blockading French high schools as students, teachers and parents take to the streets over school conditions.

In short:

Thousands of students, teachers and parents have taken to the streets across France on the biggest day of action against understaffed and dilapidated classrooms.

In Strasbourg, Lyon and Rennes, the demonstrations at times have turned violent.

What’s next?

Unions say more than half of France’s high schools are blockaded or are closed for the day, with more protests expected later.