Multiple bodies were discovered inside a Union Pacific cargo train in Laredo, Texas, on Sunday afternoon. A major investigation was underway by the local authorities. Laredo Police confirm multiple bodies found in cargo train; identities and causes of death remain unknown. (Unsplash )According to the Laredo Police Department, officers responded shortly after 2:30 p.m. local time near mile marker 13, close to 12100 Jim Young Way, an area near the Union Pacific rail yard in north Laredo. Police confirmed that multiple bodies were found inside the train but did not immediately release the exact number of victims or identify the deceased. Read more: Texas man sentenced to death for fatally stabbing girlfriend, her 8-year-old sonInvestigation ongoing as officials withhold identitiesAs of Sunday night, investigators had not announced the identities of the deceased or released details regarding possible survivors. Authorities also have not confirmed whether the train originated in Mexico. Officials also have not publicly disclosed the cause of death, how long the bodies may have been inside the railcar, or whether foul play is suspected. Investigators are currently working alongside federal authorities and medical examiners to determine the circumstances surrounding the deaths. The discovery came during a period of intense heat in South Texas. Weather data from Sunday showed temperatures in Laredo climbing to nearly 95 degrees Fahrenheit, while the heat index reportedly reached as high as 104 degrees. Authorities have not yet confirmed whether heat exposure may have contributed to the deaths. The location of the discovery, however, has given rise to the speculation that the individuals may have been migrants attempting to cross the border through freight transportation routes frequently used by smugglers. Read more: Florida man convicted for raping, killing neighbor in 1998 to be executedBorder crossing route under renewed scrutinyLaredo sits directly across from Nuevo Laredo and serves as one of the busiest trade and freight corridors between the United States and Mexico. Freight trains moving through the region have long been used by migrants and human smuggling networks seeking to avoid heavily monitored highway checkpoints. Given the location, the nationalities of the deceased people are in question. However, the police have also declined to confirm the nationalities or immigration status of the victims. In one recent case cited by border officials, U. S. Border Patrol agents in the Laredo Sector rescued 23 migrants in July 2024 after they were discovered locked inside an autorack on a Union Pacific train. Authorities said the individuals were safely removed before suffering severe medical complications.