According to msnbc.com staff and news service reports:
Violence broke out in Rome, where Italian police fired tear gas and water cannons at protesters after some smashed shop and bank windows, torched cars and hurled bottles.
TV footage showed police in riot gear charging the protesters and firing water cannons at them. A small group of violent protesters broke away from the main demonstration in the Italian capital, part of worldwide protests against corporate greed and austerity measures.
The ANSA news agency said some protesters trashed offices of the Defense Ministry and of a labor agency, smashing windows with clubs, throwing paper bombs and firecrackers and setting cars on fire.
Most of the violence took place near the Colosseum.