Italy's postal service intercepted a threatening letter containing a bullet addressed to Prime Minister Silvio Berlusconi, while letter bomb sent to a minister caught fire, police said on Saturday. A large envelope containing a letter addressed to Berlusconi with the threat "you will end up like a rat" was discovered on Friday in a post office in the Libate suburb of the northern city of Milan. The package, which also referred to other leaders of Berlusconi's centre-right People of Freedom (PDL) party, was addressed to the prime minister's private residence in the Milan region, police said. Berlusconi was in Libya...