An outbreak of vandalism Monday forced police to order more than 100,000 high school students to halt a march through Paris, the largest protest yet in a campaign for better education.

The main throng of marchers was orderly. But several hundred youths on the fringes of the crowd smashed store windows and attacked journalists, prompting police to make two arrests and disperse a group of vandals with tear gas.About two hours after the march began, Paris Police Chief Pierre Verbrugghe demanded that student leaders order the protesters to disperse. He said the throng would not be allowed to cross from the Left Bank of the Seine River to the planned ending point on the Champs Elysees.