Border Patrol agents in Texas on Monday discovered a group of illegal immigrants hidden inside a grain hopper rail car with no means of escape.

The shocking discovery was made in Hebbronville, Texas, which is about an hour's drive from the Mexican border. 

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Guatemala Mexico immigrants

CBP says the immigrants originated in Guatemala and Mexico. (CBP)

Illegal immigrants in rail car in Texas

Thirteen illegal immigrants hidden inside a grain hopper rail car.  (CBP)

Border Patrol Texas

Border Patrol agents inspect a sealed grain hopper rail car.  (CBP)

While inspecting an eastbound train, a K9 alerted a Border Patrol agent to the possibility of concealed humans or narcotics inside a grain hopper. 

Border Patrol agents climbed onboard the train and discovered 13 illegal immigrants trapped inside with no means of escape. 

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The immigrants were removed from the rail car and medically screened before being transported to the Hebbronville Station for processing, U.S. Customs and Border Protection said in a press release

CBP said a records check indicated that the immigrants had originated in Guatemala and Mexico. No further details were released. 

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The discovery came just weeks after Border Patrol agents in Arizona discovered nine illegal immigrants hidden inside an enclosed space within a cattle trailer near the Mexican border.