“Spain denies and categorically rejects any insinuation that it is involved in a political destabilisation operation in Venezuela,” the source told AFP after three Americans, two Spaniards and a Czech citizen were detained in Venezuela and accused of involvement in a plot against the government.

The government has “confirmed” that the two Spanish detainees are not part of Spain’s CNI spy agency “or any other state body”, the source added.

“Spain defends a democratic and peaceful solution to the situation in Venezuela,” the source said.

Venezuela’s Interior Minister Diosdado Cabello said Saturday that the foreign nationals were being held on suspicion of planning an attack on President Nicolas Maduro and his government.

He said two Spaniards were recently detained in Puerto Ayacucho in the southwest over the alleged plot linked to intelligence agencies in the United States and Spain as well as to Venezuelan opposition leader Maria Corina Machado.

A US State Department spokesperson said Saturday that “any claims of US involvement in a plot to overthrow Maduro are categorically false”.

The arrests come amid heightened tensions between Venezuela and both the United States and Spain over Venezuela’s disputed July 28 presidential election, which the country’s opposition accuses President Nicolas Maduro of stealing.

Maduro, who succeeded iconic left-wing leader Hugo Chávez on his death in 2013, insists he won a third term but failed to release detailed voting tallies to back his claim.

The two Spaniards, Andrés Martínez Adasme and José María Basoa, were on holiday in Venezuela, Adasme’s father told daily Spanish newspaper El Mundo.

“My son does not work for the CNI, of course not. We are waiting for information from the consulate and embassy. We still do not know what they are accused of or the reason for their arrest,” he added.

Tensions between Caracas and former colonial power Spain rose sharply after Venezuelan opposition candidate Edmundo Gonzalez Urrutia, 75, went into exile in Spain a week ago, after being threatened with arrest.

Earlier this week Caracas recalled its ambassador to Madrid for consultations and summoned Spain’s envoy to Venezuela for talks after a Spanish minister accused Maduro of running a “dictatorship.”

Venezuela was also angered by Spanish Prime Minister Pedro Sánchez’s decision to meet with Gonzalez Urrutia and warned Spain against any “interference” in its affairs.