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Italian officials on Tuesday broadened their investigation into whether the Japanese investment bank Nomura had helped hide losses at the troubled lender Monte dei Paschi di Siena by ordering the police to seize assets worth $2.35 billion.

The American embassy, consulates and various U.S. institutions in Italy were under heightened security Tuesday following explosions that killed three people near the finish line of the Boston Marathon on Monday. Police forces were called to guard American university campuses, and travel hubs such as Rome's major international airport Fiumicino upped security checks. Special attention was being paid to flights considered "at risk or sensitive," authorities said, namely on American or Israeli carriers.

Italy's anti-establishment 5-Star Movement chose a television journalist as its candidate for president on Tuesday and hinted it could co-operate with center left if she were elected.Choosing a successor to President Giorgio Napolitano, whose term ends on May 15, is a vital step toward resolving the stalemate created by an inconclusive general election in February that left no party able to form a government.

Law enforcement and Congressional sources told ABC News today there is a leading theory that at least one of the bombs that exploded during the Boston Marathon Monday may have been packed into a pressure cooker, a tactic found in rudimentary bomb-making instructions widely available online.