A witness in Valencia told Reuters she heard shooting overnight.
Global organisations such as the United Nations as well as nations in both Europe and Latin America nations have accused him of trying to cling onto power and of leading the country to impoverishment.
Still, the episode highlights how volatile Venezuela is after four months of sustained anti-government protests over what foes call a lurch into dictatorship in the midst of a bruising economic crisis.
Venezuelan security forces have taken up position outside the office of the country's chief prosecutor.
"As President Trump has made clear, the United States will not ignore the Maduro regime's ongoing efforts to undermine democracy, freedom and the rule of law", Treasury Secretary Steven T. Mnuchin said in a statement.
She alleged that authorities were desperate to get their hands on dossiers containing information on dirty dealings by high-level officials, including sensitive details about millions of dollars in bribes paid by Brazilian construction giant Odebrecht.
In Sunday's video, a man who identified himself as Juan Carlos Caguaripano, a former National Guard captain, said: "We demand the immediate formation of a transition government".
"This is not a coup d'etat", he said.
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Venezuela's defense minister says a small group of men who attacked a military base were civilians wearing military uniforms with the exception of one deserted army lieutenant.
Appointed in 2007 by president Hugo Chavez (1999-2013), Ms. Ortega was the main figure of institutional to dare to challenge publicly his successor.
But he was taken back into custody in the middle of the night Tuesday along with former Caracas mayor Antonio Ledezma in what many believed was a renewed crackdown on the opposition following the election of delegates to the constitutional assembly.
But the top brass continues to publicly profess loyalty to his government.
An opposition party official in Venezuela says a local leader has been shot dead at a protest near a military base that was attacked earlier by a group opposed to President Nicolas Maduro's government.
Discontent is higher among lower-tier officials, who are often sent to control rowdy protests and are paid just a few dozen US dollars a month.
It comes days after a controversial vote that created a new constitutional assembly which gives President Maduro virtually unlimited powers.
Its installation is virtually certain to intensify a political crisis that has brought four months of protests in which at least 120 people have died and hundreds more have been jailed. When Ortega arrived for work Saturday morning, she was barred from entering.