There has been rioting in Rome and violence in several other Italian cities after a policeman shot dead a football fan while trying to stop fighting between rival supporters.
Gabriele Sandri was shot by police after a skirmish broke out between fans of Rome's Lazio and Turin team Juventus at a motorway stop in Tuscany.
In Bergamo, a match between Atalanta and AC Milan was stopped as fans and police clashed.
The game was abandoned 10 minutes after kick-off, when fans tried to smash down a barrier and force their way onto the pitch.
Italian Prime Minister Romano Prodi has called for a full investigation into the shooting and said the violence was "very worrying".
The victim was a 26-year-old disc jockey and a Lazio fan, who had been travelling to watch his team play in Milan.
Mr Sandri was shot in a car at a motorway stop when police intervened to break up a brawl. Police said a warning shot may have caught him.