Fouad Mebazaa is sworn in less than a day after Zine el Abidine ben Ali fled the country and handed power to Mohamed Ghannouchi. Chaos and tension persist, and a prison fire reportedly kills dozens.The leadership of this troubled country changed hands for the second time in less than 24 hours Saturday as security forces and ordinary Tunisians struggled to quell mayhem that some have attributed to henchmen loyal to ousted President Zine el Abidine ben Ali.