From the BBC:
Italian Prime Minister Silvio Berlusconi has been hit in the face and knocked to the ground after a political rally in Milan.
Pictures showed Mr Berlusconi, 73, with a badly cut lip and blood on his cheek and chin. A man has been arrested.
The prime minister, looking dazed, was helped to his feet by aides and put in a car. He got out and tried to climb on the car to show he was all right.
Reports suggested he had either been punched or hit with an object.
He was taken to a hospital in Milan after the attack. The Italian news agency Ansa said he was to stay under observation for 24 hours, but there was no immediate report on the extent of his injuries.