Rioters clashed with police, looted stores and set property on fire in central Milan on Saturday, emptying Piazza del Duomo and a luxury shopping arcade when the area would usually be teeming with shoppers. The march against wars and rising living costs began peacefully. But masked protesters threw stones, paving blocks and other objects at riot police and set fire to barricades made from bar tables. Images of the aftermath showed a severely damaged carabinieri car. Police used water cannons and tear gas to disperse the crowds. At least two police officers were injured and about 50 demonstrators, including many minors, were detained, the LaPresse news agency reported.