Public defender Tarek Saab said several others were seriously injured and "between life and death".
"We don't want more violence, more dead people because of this regime, which is a criminal regime".
Elsewhere in the city, smaller pockets of violent protesters, some of them with their faces covered and throwing rocks, clashed with riot police, who responded with tear gas.
The ruling Socialist Party accuses foes of seeking a violent coup with United States connivance, while the opposition says he is a dictator repressing peaceful protest.
The protesters' main demand is for elections, although the anger is also underpinned by crippling economic crisis in the oil-producing country.
Its leaders blame Maduro for the unraveling of oil giant Venezuela's once-booming economy, which has left the country with shortages of food, medicine and basic goods.
In western Tachira, at another of the "sit-ins" planned for all of Venezuela's 23 states, some played the board-game Ludo, while others played soccer or enjoyed street theatre.
A demonstrator holds a Venezuelan flag as he takes part in a rally to honor victims of violence during a protest against President Nicolas Maduro's government in Caracas, Venezuela.
Foreign Minister Delcy Rodriguez told the state-run VTV network Saturday that three National Bolivarian Armed Forces of Venezuela lieutenants had deserted in late March and later requested political asylum in Colombia.
Journalists covering the protests said that security forces harassed them.
Ohio police trying to identify owners of dog that killed man
Dayton police were waiting Tuesday morning for a search warrant so they could enter a house near where the dogs were found. When police arrived on scene they shot and killed the dog and took the other three to Dayton's Animal Resource Center.
They have been protesting nearly daily - angered by triple-digit inflation, widespread shortages of food and medical supplies, and the policies of President Nicolas Maduro.
A second round of talks between Maduro and the opposition, which is in control of the National Assembly unicameral parliament, broke down after the Democratic Unity Roundtable, or MUD, opposition coalition said it would not engage Maduro in further negotiations unless the president's regime fulfills previous agreements struck after first-round talks mediated by the Vatican in late October. The court quickly reversed course, but its widely condemned move still galvanised the opposition.
"I'm staying here until 6 p.m". Then a string of political leaders passed around a megaphone and from the back of a pickup repeated their demand of recent days for immediate elections and freedom for dozens of jailed government opponents they consider political prisoners.
The opposition blames Maduro's regime for the deaths, whereas Maduro blames the opposition.
Maduro, in his weekly television address, supported holding elections later this year at the level of mayors and provincial governors.
Opposition leader Henrique Capriles said the government is seeking to undermine legitimate protests, and dismissed the ombudsman as a government "puppet".
Given the country's economic crisis, with millions short of food, pollsters say the ruling Socialist Party would fare badly in any vote at the moment.
The court reversed course after worldwide condemnation, but Maduro's Government further fuelled the protests by barring the opposition's most popular politician, Henrique Capriles, from holding office for 15 years.
Rival demonstrations are being held by both anti-government and pro-government groups.
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