Juan Pablo Guanipa has been "kidnapped" in the capital Caracas, opposition leader María Corina Machado said on X early Monday, local time in Sweden.
"Heavily armed men in civilian clothes arrived in four vehicles and forcibly took him away. We demand his immediate release," she wrote.
Shortly afterwards, the country's prosecutor's office confirmed that Guanipa had been arrested and said he violated the conditions of his release. It is unclear what those conditions were.
61-year-old Guanipa, who is a former vice president of Venezuela's parliament, was released on Sunday along with two other prominent opposition politicians - Perkins Rocha, former legal advisor to María Corina Machado, and Freddy Superlano, who won a gubernatorial election in former leader Hugo Chávez's birthplace of Barinas.
The release came shortly before Venezuela's parliament was set to vote on a new amnesty law on Tuesday. If passed, the law would, according to a draft previously seen by AFP, lift the ban on several prominent opposition politicians from running for political office.
The proposal, presented by interim president Delcy Rodríguez, was given the green light in a first vote last week.
At the end of January, 80 political prisoners were released in the country, barely a month after the US capture of former President Nicolás Maduro.
