Radical Basque activists wear masks as they collect stones behind a car they had overturned to use as a barricade during confrontations with police in the Basque town of Renteria May 31, 1998. Supporters of ETA Basque separatist guerrillas caused chaos in the town with violent protests after ultra-rightist leader Ricardo Saenz de Inestrillas held a political rally widely seen as a provocation. Three policemen were injured in the skirmishes.