A Bolivian air force plane crashed in the Amazonian region shortly after takeoff Saturday afternoon, killing all those on board.    

The victims on the twin-engine propeller plane included four Spanish nationals and the two-man crew, an air force captain and lieutenant. 

The Spaniards were en route to catch a flight back to Spain, the Bolivian Defense Ministry said in a statement, identifying them as Francisco José Gallegos Gonzáles, Yandira Olivera Velarde, Delis Salvatierra Velarde and Alba Aparicio Formas.     

The plane went down in a marshy area on the outskirts of the northeastern city of Trinidad, the statement said, adding that the investigation to the cause of the accident was underway.    

The aircraft was also carrying coronavirus test samples to the city of Santa Cruz.