Italians are going to the polls today in regional elections, being seen as a test of popularity for Prime Minister Silvio Berlusconi. Thirteen out of Italy's 20 regions are involved in the ballot. Mr. Berlusconi has been at the centre of a number of controversies in recent months, which may affect his party's chances.<br/><br/>Meanwhile, Italian authorities say they have intercepted a letter to Mr. Berlusconi containing a bullet. In a separate incident an incendiary device addressed to his interior minister caught fire and injured the hands of a postman in Milan.<br/><br/>