The dismissal came after Luisa Ortega Diaz denounced a "military siege" of her office by soldiers who had surrounded and prevented her from entering her workplace.
Its 500-plus-members, who include Maduro's wife and son, are led by Delcy Rodriguez, Maduro's former foreign minister.
Opposition leaders accuse the socialist government of President Nicolas Maduro of delaying elections to avoid losing power amid an economic crisis marked by triple-digit inflation and chronic food shortages.
Led by opposition leaders, lawmakers and Lilian Tintori -- the wife of jailed opposition leader Leopoldo Lopez -- the crowd carried flowers and placards denouncing "repression."
Amid another day of nationwide opposition rallies, the worst trouble in Caracas on Wednesday occurred when National Guard troops and police blocked off a highway where several thousand demonstrators were marching downtown.
The opposition's primary demand now is to hold the next presidential election before its scheduled date at the end of 2018 to push out Socialist President Nicolas Maduro.
Venezuela's pro-Maduro Supreme Court said on Wednesday it was assuming the legislature's functions because it was in "contempt" of the law. Foes lambasted that as a "coup" against an elected body.
Getting cash in Venezuela is nearly impossible. Many banks have restricted customers to small withdrawals that do not even meet their needs.
Venezuela's National Electoral Board gives opposition the paperwork needed to start the process of a recall referendum to depose President Nicolas Maduro.
Venezuela Supreme Court rejects opposition-led bill to cut President Nicolas Maduro's term.
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