French retirement protests take violent turn

PARIS -- Masked youths clashed with police and set fires in cities across France on Tuesday as protests against a proposed hike in the retirement age took an increasingly radical turn. Hundreds of flights were canceled, long lines formed at gas stations and train service in many regions was cut in half. President Nicolas Sarkozy pledged to crack down on "troublemakers" and guarantee public order, raising the possibility of more confrontations with young rioters.