Venezuela live updates: Multiple detained Americans released, State Department says

The Venezuelan Ministry of Foreign Affairs said the U.S. State Department's security alert is "based on fabricated accounts aimed at creating a perception of risk that does not exist."

The ministry said in a statement on social media late Saturday that Venezuela is "in absolute calm, peace, and stability," and that all weapons are in the government's control.

"The Bolivarian Republic of Venezuela reaffirms its commitment to the protection of peace, institutional stability, and the coexistence of the Venezuelan people," the statement said in Spanish.

The U.S. State Department had earlier warned U.S. citizens in Venezuela to leave immediately, saying in part that there were "of groups of armed militias, known as colectivos, setting up roadblocks and searching vehicles for evidence of U.S. citizenship or support for the United States."

-ABC News' Anselm Gibbs

The State Department warned U.S. citizens in Venezuela Saturday to leave immediately

"There are reports of groups of armed militias, known as colectivos, setting up roadblocks and searching vehicles for evidence of U.S. citizenship or support for the United States. Remain vigilant and exercise caution when traveling by road," the agency said in a statement.

The U.S. Embassy in Colombia issued a more detailed alert reaffirming that the U.S. has a Level Four "do not travel warning" for Venezuela, urging U.S. citizens not to travel to Venezuela.

-ABC News' Luis Martinez