Venezuelan opposition politician Juan Pablo Guanipa has returned home after being captured by security forces on Sunday - but is under house arrest, his son has said. Ramón Guanipa said while his family was relieved, his father remained unjustly imprisoned. The country's opposition leader María Corina Machado said on Sunday that Guanipa had been taken in the capital Caracas by heavily armed men. It came hours after Guanipa and other political prisoners were released. Venezuela's Interior and Justice Minister Diosdado Cabello later stated that a person was rearrested for violating the conditions under which he was released. Some politicians believed they could do whatever they wanted, Cabello added on Monday. A former vice-president of the National Assembly, Guanipa spent eight months in prison and is among several political prisoners to have been freed since the US seized Venezuela's President Nicolás Maduro in January. In an interview with the BBC on Tuesday, Ramón said his father, leader of the Justice First party, was released from prison at about 11:00 local time (15:00 GMT) on Sunday. After spending time with families waiting for the release of other political prisoners, Guanipa made some statements and mobilised supporters, only to be kidnapped later by unidentified security forces. Ramón confirmed on Tuesday afternoon that Guanipa is back home but emphasized the need for his full freedom and the release of all political prisoners. Ramón expressed gratitude towards the US government for its support and called for international attention towards Guanipa's situation.