The main Milan stock exchange index fell by more than two percent at the start of trading on Monday after Moody\'s warned it may cut Italy\'s credit rating in view of strains in the economy. Banking stocks were among the worst affected, with shares in Intesa San Paolo dropping 2.42 percent to 1.775 euros and UniCredit plunging 2.36 percent to 1.487 euros following Moody\'s announcement on Friday.