Three Americans, two Spaniards and a Czech national were arrested on Saturday after Venezuelan officials accused them of coming to the South American country to assassinate President Nicolas Maduro.
The arrests were announced on state television by Diosdado Cabello, the country's interior minister.
Cabello said the foreign nationals were part of a CIA-led plot to overthrow the Venezuelan government and kill several members of its leadership.
The arrest of US citizens included a member of the Navy, whom Cabello identified as Wilbert Joseph Castañeda Gomez. Cabello said Gomez was a Navy SEAL who had served in Afghanistan, Iraq and Colombia. Meanwhile, the other two Americans arrested are David Estrella and Aaron Barrett Logan.
In addition to the Americans, two Spanish nationals were arrested; José María Basoa Valdovinos and Andrés Martínez Adasme and the Czech citizen, Jan Darmovzal. Venezuelan authorities have also seized 400 American rifles linked to the alleged plot, he said.
On the TV show, Cabello showed images of weapons he said were confiscated from some of the alleged plotters.
Interior Minister Diosdado Cabello claimed the alleged plot was led by the CIA and aimed at killing the country's leader Nicolás Maduro.
But the US State Department dismissed the claim as "categorically false".
"Any allegation of US involvement in a plot to overthrow Maduro is categorically false. The United States continues to support a democratic solution to the political crisis in Venezuela," the statement said.
The announcement of the arrests comes just two days after the US Treasury imposed sanctions on 16 allies of Maduro, who were accused by the US government of obstructing voting during Venezuela's disputed July 28 presidential election and of human rights violations.
Tensions between the Venezuelan government and the US have also risen following the election, the result of which sparked protests within Venezuela in which hundreds of opposition activists were arrested.
Maduro was declared the winner of the July election by the National Electoral Council, which is affiliated with the government in Venezuela.
But the Council did not release details of the votes that supported Maduro's victory.
Information published by the opposition suggested that its candidate, Edmundo Gonzalez, was the winner.