CARACAS (AFP) -- Hundreds of protesters marched in Caracas Saturday to call for a ""no"" vote in a referendum next month that could pave the way for Venezuelan President Hugo Chavez to stay in power indefinitely.

The procession, organized by various opposition groups, took place amid high tensions following violence over the past few days between protesters and pro-Chavez supporters.
Four students suffered gunshot wounds on Wednesday when an armed group stormed the university campus in Caracas as demonstrators were returning from a protest.
On Friday, another six people -- four of them policemen -- were wounded by shots in the western town of Merida during another student demonstration. Two journalists were also attacked, the newspaper El Universal reported.
University students are in the vanguard of the opposition against the December 2 referendum called by Chavez that proposes 69 constitutional amendments.
The left-wing Venezuelan leader, popular among his country's many poor, is seeking changes that would extend his term of office, and allow him to seek re-election as often as he wants.
Saturday's march filed three kilometers (two miles) through streets behind a truck blaring out slogans denouncing the referendum and the recent violence.
It was to culminate in a city school, where university students and politicians were to address the crowd.
One of the messages held aloft a saying by Venezuela's biggest hero, the 19th century independence leader Simon Bolivar: ""Nothing is as dangerous as to let the same citizen remain in power for a long time. The people get accustomed to obeying him, and he gets accustomed to commanding them; this is where usurpation and tyranny originate.""