A close ally of Venezuelan opposition leader Maria Corina Machado was placed under house arrest Tuesday, detained just hours after his release from prison along with other dissidents jailed under ousted leader Nicolas Maduro.

Juan Pablo Guanipa, a former National Assembly vice president, walked out of jail on Sunday after spending more than eight months behind bars on vague charges of the kind often leveled against government critics, including “terrorism,” money laundering and inciting violence.

The 61-year-old was released with other political prisoners under a promise made by interim leader Delcy Rodriguez, who filled Maduro’s shoes after his toppling in a deadly US military raid in January.

During his few hours of freedom, Guanipa met relatives of other political prisoners, toured Caracas in a motorcycle caravan, shouted slogans outside the feared Helicoide prison, and demanded new elections.