Opposition members wave nationals flags during a march to protest against the Venezuelan National Electoral Council in downtown Caracas

Supporters of Venezuelan President Hugo Chavez have clashed with his opponents who rallied in Caracas to demand electoral reform ahead of congressional elections in December.

Officials say six people were injured Saturday as the two sides skirmished in a volley of smoke bombs, rocks, bottles and fireworks. The injured included one woman who was struck in the back of the head.

The anti-Chavez demonstrators say Venezuela's electoral board is biased and must be overhauled before the December vote.

Chavez critics accuse him of becoming increasingly authoritarian and say he is trying to model the oil-rich country after communist-led Cuba. The Venezuelan president has said he is working to improve the lives of the country's impoverished majority.

Some information for this report provided by AP and Reuters.