Edinburg Assistant Police Chief Oscar Trevino says the immigrants may have been locked inside the 18-wheeler in Edinburg for at least eight hours before being freed by officers late Sunday morning. He had earlier said there were 17 immigrants locked in the tractor-trailer before correcting the number yesterday to 16.
Trevino said none of the people inside the tractor-trailer required medical attention. He said they were hungry and thirsty and were given food and water at the scene. Those found locked in the tractor-trailer included eight people from El Salvador, six from Mexico and two from Romania, said Manuel Padilla, US Customs and Border Protection's Border Patrol sector chief for the Rio Grande Valley at Texas' southernmost point.
US Immigration and Customs Enforcement spokeswoman Nina Pruneda said no one has been charged yet in connection with the case but that the agency is working with state and local officials and talking to witnesses.
The discovery comes three weeks after 10 people died in a sweltering rig parked at a Walmart in San Antonio. Immigration officials say survivors estimated 100 people had been packed into the back of the 18-wheeler at one point. Officials said 39 people were inside when rescuers arrived, and the rest either escaped or hitched rides to their next destination.
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On Sunday, Edinburg police went to the gas station, a popular stopover for commercial truck drivers traveling through the region, after receiving an anonymous call from someone saying a relative was trapped inside the tractor-trailer.
Officers began knocking on the sides of trailers parked at the station and eventually received return knocks from the one holding the immigrants, police said.
Authorities have not said if similar arrangements had been made for the immigrants found in Edinburg, about 230 miles (370 kilometers) south of San Antonio.
Trevino said that they discovered the immigrants after one of the people locked in the tractor-trailer called a relative in Mexico. The relative then called authorities.
"You don't know how many you miss," Padilla told The Associated Press on yesterday. "But ... The use of tractor- trailers to smuggle people out of this area is higher in South Texas, to include Laredo, than any other area along the border. And it goes right back to a weak border."
Tractor-trailers emerged as a popular smuggling method in the early 1990s amid a surge in US border enforcement in San Diego and El Paso, Texas, which were then the busiest corridors for illegal crossings. Before that, people paid small fees to mom-and-pop operators to get them across a largely unguarded border.