The observers reported polls saw better conditions than previous years, but raised concerns over some practices.
The polls mark the first time in four years that the main opposition parties will participate in an election.
Saab is accused of paying bribes to siphon $350m from state contracts to build housing for Venezuela’s government.
The so-called ‘Citgo 6’ have been held since 2017, with the US accusing Caracas of using the group as a bargaining chip.
President Nicolas Maduro says Venezuelan government respects ICC decision to open probe, but ‘we do not share it’.
Judge keeps in place one charge of conspiracy to commit money laundering, which carries maximum 20-year prison sentence.
US prosecutors charged Saab in connection with a bribery scheme linked to Venezuela’s state-controlled exchange rate.
Alex Saab, who was arrested in Cape Verde last year, was extradited to the US to face money laundering charges.
New report says independence of judiciary has eroded, allowing abuses, including torture, to persist.
Government hopes talks will help ease sanctions while opposition wants guarantees of free and fair regional elections.
Maduro is pressing for the lifting of sanctions imposed by the United States and Europe.
Plan to sign a framework agreement to start talks hit a snag when Maduro camp rejected Guaido US envoy, say sources.
Release of nearly $2bn Venezuelan gold held by Bank of England hinges on who London recognises as the country’s leader.
Freddy Guevara’s arrest came as unidentified armed men threatened opposition leader Juan Guaido in his carpark.