florence italy former italian prime minister silvio berlusconi investigation part investigation mafia bomb 1993 judicial source say tuesday confirm newspaper report mob boss jail deadly attack rome milan florence record talk cellmate four-times premier prompt judge florence reopen shelve probe berlusconi allege involvement italian newspapers corriere della sera la repubblica report berlusconi lawyer nicolo ghedini say previous investigation show client involve bomb kill 10 people ghedini say case re-emerge political reason ahead important regional ballot sicily sunday national election due next may even speculate berlusconi could way involve events question absurd make comment unnecessary ghedini say statement obvious umpteenth investigation end swift dismissal happen past previous probe 81-year-old media mogul allege involvement case shelve 2011. berlusconi due visit sicily late tuesday campaign forza italia go italy party ahead sunday regional election judge investigate mafia case rake arguably murky years modern italian history hear fragment record conversations mob leader giuseppe graviano last april jail newspapers report 1992 already want get involve politics ... want everything graviano reportedly record say refer berlusca common nickname berlusconi berlusca ... ask favor ... convince berlusconi would win election ... sicily ... want get involve ... time old guy around ... tell need really good thing mafia bomb campaign mainland italy stun country help lead collapse old political party riddle corruption berlusconi enter politics early 1994 immediately national election forza italia say statement 1,296 mafiosi arrest berlusconi years office 2001-05 2008-2011 include 32 italy want mobsters say berlusconi administration toughen prison condition mobsters seize 25 billion euros 29.09 billion mafia property last three years office 0.8595 euros italy 's berlusconi probe deadly 1993 mafia bomb source