Supporters and opponents of Venezuela's leftist government have staged rival rallies in Caracas that took place amid protests and spiralling discontent at the country's stubborn inflation and basic goods shortages.
About 3,000 opponents dressed in white and carrying red, blue and yellow Venezuelan flags gathered in an affluent area of the capital on Saturday, fanning out into nearby streets, just days after demonstrations left three people dead.
The protesters, mostly students, have spearheaded nearly two weeks of marches against President Nicolas Maduro, angered by rampant crime, rising prices and a lack of essential supplies as basic as toilet paper in a nation that sits on top of the world's largest proven oil reserves.
On Saturday the demonstrators demanded the release of about 100 detained students and other opposition activists, and an end to police repression, but at least one protest ended with police officers firing tear gas.
The depth of the unrest on what is now the 12th day of street protests was underscored by Maduro's decision to address a counter-rally, and by US Secretary of State John Kerry voicing alarm at the reported arrests.
But speaking before thousands of supporters gathered in downtown Caracas, Maduro accused conservative Colombian ex-president Alvaro Uribe, whom he regards as a US ally and foe of Venezuela, of "funding and directing" the "fascist movements" he blames for the unrest.
Maduro's elected socialist government has also taken Colombian news channel NTN24 off the air, saying it was inciting anti-government violence.
Protests have taken place in different cities in Latin America, and on Saturday, dozens of activists, many of them youths, rallied in front of the Venezuelan Embassy in Washington.
A handful of pro-government protesters held banners at the embassy gates that read "We are with the Bolivarian revolution".
Top US diplomat Kerry said in a statement that reports of Venezuela's leaders arresting scores of anti-government protesters would "have a chilling effect on citizens' rights to express their grievances peacefully," and he called for all parties to work together to resolve tensions.
Two anti-government protesters and a pro-Maduro demonstrator died in a rally Wednesday, in violence that raised alarm throughout Latin America and also in Europe. Some 60 people were also injured.
Maduro says the protests against him signal the rumblings of a coup to depose him, vowing to use force to prevent unauthorised street gatherings.
The president has accused opposition leader Leopoldo Lopez of being one of the main backers of the protests, and says he is wanted for arrest.