Ramon Muchacho, mayor of the Caracas Municipality of Chacao - an opposition stronghold - reported nine injuries including a gunshot victim, after the clashes with police and a rival protest by government sympathizers.
Security forces using teargas and pepper-spray blocked them from reaching their rallying point.Opposition leaders led demonstrators onto highways to block traffic, and some youths donned masks and tossed stones in skirmishes with police and soldiers around the city. Protesters were making barricades and attacking the riot police with rocks and bottles.
Opposition activists said armed, pro-government gangs on motorcycles fired into the air.
"We're going to get rid of them but we have to fight", said Jose Zapata, 57, as he marched with a stick in his hand.
The National Assembly cited Attorney General Luisa Ortega until then a long-time supporter of embattled President Nicolas Maduro and his mentor and predecessor the late Hugo Chavez - who had said Friday that the courts maneuvers constituted a coup, and all hell broke loose.
Overlooking one wide avenue, some pro-Maduro residents in a state housing project threw trash onto protesters below.
Borges wants the Supreme Court magistrates who chose to take away power from the opposition-controlled congress last week to be removed. They claim the judicial branch is controlled by the ruling United Socialist Party of Venezuela.
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Although it retracted that ruling over the weekend, the National Assembly remains powerless due to previous court judgments.
"Here the world can see the dictatorial path Mr Maduro has chosen", Capriles said.
"From the north (the US), they give the order to the defeated fascist right of Venezuela to fill the streets with violence and blood", Maduro said on state TV.
Maduro says his foes are seeking a coup with the help of Washington and compliant foreign media. The head of the OAS, Luis Almagro, has called for Venezuela to be expelled from the group, which would further isolate Maduro.
"In Caracas, in Venezuela, peace has triumphed once again".
The Bolivarian Republic of Venezuela responsibly denounces before the worldwide community an unprecedented act aimed at the destruction of the Organization of American States, through which a group of governments in league with the Secretary General, have carried out a take-over of the Presidency of the Permanent Council to impose on the organization and the rest of its member-states their own illicit agenda, which subverts its norms and seriously transgresses the principles and aims consecrated in its Founding Charter.
This new violation constitutes yet another violation of the civil and political rights of the population, while at the same time violating the right to life and physical integrity of the Venezuelan opposition. Legislators also plan this week to start proceedings to remove Supreme Court judges but that would only be a symbolic rebuke since congress has no power to act.