Italy's reputed No. 1 Mafia boss, Bernardo Provenzano, was arrested Tuesday in the Sicilian countryside after more than 40 years on the run, the Interior Ministry said. Provenzano, Italy's most wanted man, is believed to have taken over the Sicilian Mafia after the 1993 arrest of former boss Salvatore "Toto" Riina in Palermo. Police had arrested "the man who, after the arrest of Toto Riina, is considered the most important person from Cosa Nostra," Interior Ministry Undersecretary Alfredo Mantovano said. He described the development as "an important step forward ... for the entire nation."