PARIS, France (CNN) -- As arson and violence spreads into regional France and central Paris, French President Jacques Chirac has vowed to crack down on the perpetrators."The absolute priority is to reestablish security and public order," Chirac told the nation Sunday after emerging from an emergency meeting with top members of his Cabinet. "The law should have the final say, and the republic is determined to be stronger than those who want spread violence and fear. Those people will be apprehended, judged and punished."As he spoke, increased security efforts were already visible in the capital, where thousands more police were in the streets and helicopters hovered overhead. Chirac also said he also wants to address what some observers have blamed as the cause -- unemployment as high as 50 percent among the nation's poor immigrant youth and discrimination against them.An official with the Interior Ministry listed Sunday's vandalism: in the western city of Nantes, a pre-school was set afire; in the eastern city of Colombe, rocks thrown at two buses hit a 13-month-old child, who was in serious condition; in the northern city of Rouen, a police barricade was set afire and a burning car was pushed into the police station; and in Strasbourg, near the German border, a school was torched.A church was set ablaze in the southern fishing town of Sete and another in nearby Lens, Pas de Calais; two schools in the southeastern town of Saint-Etienne and a police station in the central France town of Clermont-Ferrand were torched, as was a social center in Seine-Saint-Denis, near the border with Switzerland.Overnight Sunday into Monday, 528 cars had been set ablaze, and 95 people detained throughout France, an Interior Ministry official said. Thirty-four police were hurt, two of them seriously, he said.Since October 27, 3,460 cars had been torched, the official said. Earlier, more than 300 people were arrested Saturday night, when protesters expanded their arson rampage to Paris and the Mediterranean cities of Cannes and Nice overnight, said Interior Minister Nicolas Sarkozy.Sarkozy praised police efforts and said anyone involved in the unrest "will be held accountable in front of the law."The riots began after the October 27 electrocution deaths of two black teenagers, who climbed an electrically charged fence while running from police. Residents blamed police for the deaths. (Paris has simmered)There have been calls by opposition groups on the left, including the Green Party and the Communist Party, for Sarkozy to resign after he called the rioters "scum" earlier in the week -- language that served only to inflame the vandalism. (Watch French teens explain why they're angry -- 2:08)The spreading violence has shocked national leaders and community residents into action as the French prime minister held special meetings Saturday and as many as 3,000 concerned citizens participated in a silent march.Mediators and religious leaders are talking to the youths in an effort to stop the violence. French Muslim groups also issued a fatwa against the violence, according to Reuters. (Full story)The Union of French Islamic Organizations (UOIF) condemned the disorder and destruction the riots had caused. Warning to touristsThe rioting prompted warnings from the U.S. and British governments for visitors to be aware of the situation and avoid the affected areas.National police spokesman Patrick Hamon told The Associated Press that arsonists were moving beyond their heavily policed neighborhoods to less protected areas."They are very mobile, in cars or scooters. ... It is quite hard to combat," Hamon told AP. "Most are young, very young, we have even seen young minors."There appeared to be no coordination between separate groups in different areas, Hamon told AP. But within gangs, youths were communicating by cell phones or e-mails. "They organize themselves, arrange meetings, some prepare the Molotov cocktails."The U.S. Embassy in Paris has issued a public announcement warning American travelers about the rioting."Although the riots have occurred in areas not normally frequented by U.S. tourists, travelers should be aware that train travel from the Charles de Gaulle Airport to the city center may be disrupted at times, as it passes near the affected area," according to the announcement, dated Friday."Travelers could rely instead on airport buses or taxis to downtown Paris. Americans should avoid the affected areas." CNN's Chris Burns and Hayat Mongodin contributed to this reportCopyright 2005 CNN. All rights reserved.This material may not be published, broadcast, rewritten, or redistributed. Associated Press contributed to this report.