What’s behind French student protests that turned violent?

Protests over crowded classrooms, teacher shortages and lengthy school days have spread across France, with police detaining more than 400 people, many of them minors, on Tuesday. The movement began at high schools in the Paris area last week before expanding nationwide. Some school blockades turned violent as protesters burned rubbish bins and hurled bottles at officers, who responded with batons and tear gas. Authorities said 48 law enforcement officers were injured. The unrest coincided with a public sector strike over the government’s budget plans, adding to political tensions and a headache for Emmanuel Macron ahead of next year’s presidential election. Here is what we know.