Defense Secretary Roger Luncheon says Guyana's military was told to remain "vigilant," during a planned visit by Venezuelan opposition officials under military protection to a Guyana-held area claimed by both South American countries along the Essequibo River.
Guyana's government has not taken such a step since 1982, when Venezuelan military planes flew over an area it has claimed in a border dispute that goes back decades.
Luncheon said today there has been a surge of nationalistic rhetoric among candidates in Venezuela's upcoming municipal elections.