TUCSON -- Four immigrants attempting to cross the Arizona-Mexico border were found dead and several others had to be rescued as temperatures plunged across the area in a late-winter storm.
The four, all men believed to be Mexican nationals, likely died from hypothermia or exposure, said Gustavo Soto, a spokesman for the U.S. Border Patrol.
The men were discovered over the weekend.
Tohono O'odham police notified Border Patrol agents of the first death about 11 p.m. Friday.
The man, in his 40s, was crossing with a group when he became ill and unable to walk. His smuggler abandoned him with another man, and the pair found a shed near the village of Pisinimo.
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The man's friend went for help and was able to contact Tohono O'odham police, who returned to find the man dead, Soto said.
About 3:30 a.m. Sunday, agents responded to a call about a group near Arivaca and detained 12 undocumented immigrants. The group told agents they had left three people behind.
Agents found one man dead and provided medical attention to another man and a woman, Soto said.
Two other fatalities were reported to the Border Patrol by Pima County Sheriff's deputies near Green Valley. An ambulance driver found a group who reported two men, one in his 20s and the other in his 50s, had died, Soto said.
Various groups of immigrants turned themselves in because of the cold weather, he said.
The Border Patrol reports 26 illegal immigrants have died in the Tucson sector since Oct. 1, compared with 50 over the same time period last year, he said.