On September 17, teachers at the “Antoine de Saint-Exupéry” High School in Créteil, a southeastern suburb of Paris, went on strike to draw attention to the shortage of staff. Together with students and parents, they blocked the school entrance.
Videos of the blockade quickly spread on social media, causing protests to spread to high schools across France. This marked a rapid escalation from initial discontent into a nationwide movement.
Taken from NBC News