Rail workers in Texas found six people dead inside a boxcar at a yard close to the Mexican border on Sunday afternoon, officials said. The discovery was made by a Union Pacific employee inspecting the stopped train at the yard in Laredo before it continued its journey north, a spokesperson for the Laredo police department said, citing the railroad freight company. Authorities are working to establish a cause of death for the six, who were found at about 2.30pm local time on an afternoon when temperatures climbed above 90F (32C). Nobody was found alive in the boxcar, the spokesperson said. “It’s a very unfortunate event. It was too many lives that were lost,” Jose Espinoza, the department’s public information officer, told CNN , adding that the ages and immigration status of the deceased were not yet known The investigation, he said, was at a preliminary stage. US Customs and Border Protection (CBP) said it was aware of the incident, and referred questions to the Laredo police department and Texas Rangers.…