The Venezuelan government has begun releasing detainees considered political prisoners by human rights groups, in what officials described as a goodwill gesture.
Spain's foreign ministry said five of its nationals, including one dual national, had been released. Among them is thought to be rights activist Rocio San Miguel.
The move comes after the US took Venezuela's President Nicolas Maduro in a lightning raid on the capital, Caracas, on Saturday, to face drug trafficking charges in New York.
The release of political prisoners in Venezuela has been a long-held US demand, especially during moments of heightened repression during elections or protests.
Jorge Rodriguez, the head of Venezuela's National Assembly and the brother of its interim president Delcy Rodriguez, announced on state television that "a significant number" would be released immediately, without specifying the number or identity of prisoners being freed.
