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Texas officials announced six illegal immigrants were found dead Monday inside a shipping container along the southern border, with the train originating from California.

The Webb County Medical Examiner's Office confirmed three men, one woman and a 14-year-old boy were found dead at the Union Pacific Railyard in North Laredo.

The sixth person has not yet been positively identified.

Investigators said the deceased originated from Mexico and Honduras.

Police at scene

Authorities have identified five of the six migrants with hypothermia suspected as the cause of death. (KABB)

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Laredo Police Chief Miguel Rodriguez Jr. confirmed the shipping container originated from Long Beach, California, according to a report from affiliate FOX 11 Los Angeles. 

Two days into its trip, the train stopped in Del Rio, Texas. From there, the group traveled to the San Antonio area where a railroad employee discovered the bodies, according to the report.

Railroad

Six illegal immigrants were found dead Monday inside a shipping container in Texas. (KABB)

Authorities said five of the people died from heatstroke and one died from hyperthermia. 

The Webb County Medical Examiner's office said ID cards and cell phones were found and fingerprints were shared with the U.S. Border Patrol’s Missing Alien Program.

Scene where 6 bodies were found

Officials said the migrants were from Mexico and Honduras. (KABB)

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The Webb County Medical Examiner's Office is working in close coordination with the Mexican Consulate to contact the migrants' families, confirm the final identity and assist with the repatriation process.

Homeland Security Investigations (HSI) is leading the investigation, along with the Texas Rangers and local police.

Webb County and Union Pacific did not immediately respond to Fox News Digital’s request for comment.