A street march by hundreds of Venezuelans opposed to President Hugo Chavez turned violent Saturday as purported government supporters threw rocks and tear gas canisters at protesters. Roughly 1,000 demonstrators were marching through the capital to demand that officials on the National Election Council, which is seen as pro-Chavez by government opponents, are replaced before upcoming congressional elections. Six people were injured when alleged Chavez supporters attacked the march, launching fireworks and throwing glass bottles, rocks and tear gas canisters, Caracas Fire Chief Delio Martinez said. Demonstrators chanted anti-Chavez slogans and waved Venezuelan flags. One man held a banner reading: "We Need A New National Elections Council, Now!" Opposition leaders claim the council is dominated by government-friendly directors who cannot guarantee a transparent vote. Electoral officials insist their council is independent and that thorough preparations have been made for fair elections, AP reports.