(CNN) --
Authorities found 46 dead migrants inside a truck in San Antonio, Texas, according to City Councilwoman Adriana Rocha Garcia, who says she was told about the situation by the San Antonio police chief.
Rocha Garcia, who represents San Antonio District 4, told CNN Monday night that 16 other people were taken to the hospital.
The San Antonio mayor's office tells CNN a news conference is planned for 10 pm ET.
Mexican Foreign Secretary Marcelo Ebrard said through his Twitter account that a Mexican consul was on his way to the site.
According to Ebrard, the migrants would have died "asphyxiated."
"Condolences to the victims and their families. We still do not know nationalities," wrote the foreign minister of the government of President Andrés Manuel Obrador, who will meet with the president of the United States, Joe Biden, next July to discuss, among others, the issue. migratory.
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