"We are talking about close to 30 dead," he said. "Between 50 and 60 border patrol officers were on board. Some are still trapped," Flores added.

The cause of the predawn accident, in which the bus with 60 police officers aboard plunged some 15 meters into a dry riverbed, was unclear, said Gustavo Solis, mayor of Rosario de la Frontera in Salta province.

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