According to Venezuelan officials, the man was plotting attacks targeting the country's oil industry and electrical system, which have both been under significant pressure, especially during the coronavirus pandemic. Bundles of American cash and a number of weapons were also allegedly seized from the group, including plastic explosives and a grenade launcher.
Outlets close to the ruling Socialist Party identified the detainee as a former marine, John Heath Mattew, and said he was arrested on Thursday with three other people including a sergeant major in Venezuela's National Guard as they drove between Falcon and Zulia states in northwestern Venezuela.
"All the Venezuelan citizens are going to be charged with the crimes of treason, terrorism, illicit traffic of weapons and association (to commit crimes), while the U.S. citizen is going to be charged with terrorism, illicit traffic of weapons and association", Saab told state television.
Venezuelan President Nicolas Maduro last week announced the capture of an unnamed USA citizen arrested while allegedly spying on the country's Amuay and Cardon refineries in western Falcon state, while carrying "specialized weapons" and large amounts of cash.
Heath has been charged with terrorism, trafficking illegal weapons and conspiracy, authorities said.
The arrest surfaced as this nation, once wealthy from oil, has been gripped by a deep petrol shortage that has sparked mile-long lines to fuel up, even in the capital of Caracas. The three Venezuelans accused of conspiring with Heath include a military officer, Saab said, adding that they helped him enter from Colombia. He only had a copy of his passport, hidden in his shoe, and refused to unlock his satellite phone for the authorities, Saab said.
Venezuela's President Nicolas Maduro speaks in Caracas Venezuela
He also said Mr Heath was carrying a "coin" linking him to the Central Intelligence Agency, without providing details, and said he had previously worked for a private military contractor.
MVM provided a statement to the AP saying that Heath is "not now an employee or contractor" with the firm.
Caracas last month sentenced two former USA soldiers to 20 years in prison for their role in a May incursion aimed at ousting Mr Maduro.
The ex-Green Berets in Goudreau's force - Luke Denman Airan Berry Venezuela - have been sentenced to 20 years in prison.
While the Trump administration denied having anything to do with the bungled May incursion, Washington backs Venezuelan opposition politician Juan Guaido as the country's legitimate leader in place of Maduro.