Explosion near central Rome post office

(ANSA) - Rome, May 12 - A rudimentary explosive went off near a central Rome post office on Friday. No one was injured but some cars in the Aventino area were damaged. Witnesses said they hear two blasts, one of which was bigger than the other.
    Prosecutors have opened an investigation and the possibility that anarchist extremists could have planted the explosive is considered a possibility, sources said.