From the Guardian:
Silvio Berlusconi has been punched in the face at a rally in Milan tonight, according to Italian news reports.
The Italian prime minister was whisked away in a car after falling to the ground during the attack. State television showed Berlusconi with blood on his lips as he was lifted to his feet by aides.
Police initially said a young man had punched Berlusconi in the face outside the Piazza del Duomo, but later said the man might have hurled an object at the premier from close range. A man was arrested at the scene, according to the Ansa news agency.
A spokesman for Berlusconi said he did not immediately have any information about the incident, which happened after the premier delivered a speech to his conservative supporters this evening.
"What they've done to Berlusconi is an act of terrorism," Umberto Bossi, head of the far-right Northern League and a close Berlusconi ally, told Ansa.
Not for nothing, it looks like Berlusconi tried to go after the guy - once he was able to get up that is.