Rights groups, students and some political opponents have accused the French police of using disproportionate force during a more than two-week-old wave of student protests that has exposed deep-seated public anger ahead of elections next year.
Interior Minister Laurent Nunez said he had ordered the stun grenade suspension until there was more clarity around the events that took place in the northern city of Lens on Monday.
Nunez said there was a "strong possibility" the firing of a non-lethal stun grenade had caused the teenager to lose his hand.
"I am suspending their use for the high school students' movement until light has been shed on what happened in this case," said the minister, who added that 18 investigations in total had been referred to the police inspectorate.
The high school students are angered over dilapidated infrastructure, teacher shortages, overloaded schedules and a lack of funding in education.
They blame the poor learning conditions for France's worsening scores in the OECD's Programme for International Student Assessment (PISA), which have fallen faster than the OECD average since 2015, according to the rankings.
In reading, French 15-year-olds, the age when high school begins, scored 43 points lower in 2025 than a decade earlier, the biggest drop in the OECD.
Their maths scores also dropped the most.
Protests showed no sign of easing on Wednesday, with more than 500 schools closed a day after demonstrations swept across the country.
Unions called for another day of street marches later in the week.
French Prime Minister Sebastien Lecornu has acknowledged the "legitimate" demands of France's students but also described the unrest as the most violent student demonstrations in decades.
Progressive and nationalist populist parties are frontrunners in the presidential race to replace Emmanuel Macron six months ahead of the election.
Under pressure to tame public debt amid weak growth, the government has little spare cash to address the students' complaints of understaffing, a lack of investment in ageing school buildings and inequality between regions.
The CGT trade union, France's second-largest, said it would rally behind the student union's call for further street protests on Thursday.
"The CGT will continue to shoulder its responsibilities in supporting the young people who have mobilised and protecting them from violence and police repression," a CGT statement said.
In a sign the protests in France might spur unrest elsewhere in Europe, where budgets have been under pressure as governments respond to successive cost-of-living and energy crises, students in parts of Belgium have launched copycat actions.
In the Belgian city of Liege in the southern French-speaking Wallonia region, at least 107 people have been arrested in connection with student protests this month, the Belga news agency reported.
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