A police spokesman says the truck driver lost control as he was rounding a corner and heading down a hill early Saturday near a town called Miracles in the northeastern state of Bahia. The truck was carrying a load of construction materials, which also slammed into the bus.
The driver of the truck survived and is in a local hospital. Some of the others injured are in grave condition.
The police official spoke on condition of anonymity, saying he was not authorized to provide details.
He says an investigation is ongoing.
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