Venezuelan opposition leader and self-proclaimed acting president Juan Guaido said on Tuesday that troops had joined his campaign to oust President Nicolas Maduro as the government vowed to put down what it called an attempted coup.

Venezuelan opposition leader Juan Guaidó has met obstacles at nearly every turn since he declared presidential powers in a bid to end socialist President Nicolas Maduro's rule, and his visit to this once-thriving oil center was no different.

He was forced to take a boat to outmaneuver police roadblocks and reach throngs of supporters waiting to hear him speak in the sweltering heat in Maracaibo, a city now infamous for its blackouts.

US Secretary of State Mike Pompeo began a four-nation tour of Latin American allies Friday, arriving in Paraguay after talks in Santiago with Chile's President Sebastian Pinera that focused on Venezuela and the growing commercial influence of China.

A new blackout across large parts of Venezuela, including the capital Caracas, forced many to spend another night in the dark Tuesday, AFP and accounts published on social media said.

Venezuelan opposition leader Juan Guaido has launched what he promised will be a "definitive" escalation of pressure to force the country's embattled leftist leader from office.

The EU on Thursday condemned a decision to strip Venezuelan opposition leader Juan Guaido of immunity from prosecution, calling it a "serious violation" of the constitution that undermined the chances of a peaceful solution to the country's crisis.

Venezuela's Supreme Court called Monday for Juan Guaido to be stripped of his legislative immunity, tightening the noose on the opposition chief just days after authorities announced a ban on him holding public office.

Guaido -- recognized as Venezuela's interim president by some 50 countries -- is locked in a power struggle with President Nicolas Maduro that has drawn in neighboring states as well as superpowers such as the US and Russia.

Venezuela's President Nicolas Maduro announced 30 days of electricity rationing on Sunday, after his government said it was reducing the length of the workday and keeping schools closed due to devastating blackouts plaguing the country.

A new blackout hit Caracas and other major Venezuelan cities on Friday, the third major electricity outage in the crisis-plagued country this month.

Venezuelan President Nicolas Maduro's regime, bolstered by a Russian military deployment infuriating the US, on Thursday announced a ban on Washington-backed self-declared interim leader Juan Guaido holding public office.