French students said they will keep blocking the schools.

PARIS — French student unions said Friday they will keep up protests over conditions in the schools, after the government promised its first concession. The education ministry said 141 schools remained shut. Education Minister Edouard Geffray told TF1 that 3,000 more teachers would be sent into classrooms, at a cost of several dozen million euros, effective immediately. Unions called another round of nationwide school strikes for Tuesday. Police cleared a blockade Friday morning at Assas, the law school in central Paris. Mines Paris, the engineering school nearby, was also disrupted.

The Interior Ministry said 71,500 people marched Thursday, 24,500 of them in Paris. Nearly 10 percent of teaching hours at state high schools go unstaffed, the ministry’s own figures show. Reuters reported that wealthier parents have been leaving the public schools. Investors are watching what a cash-strapped government spends to end the blockades.

Within the next hours, 3,000 teachers will be joining these institutions.

The photograph is a Paris street during the school protests: police moving, demonstrators behind them. It is not the Assas doorway on Friday morning. The World desk files the schools. The dead in Ukraine are on the war page.