Carrick Cook, a spokesman for the Arizona Department of Public Safety, says the victims were all inside the van when the crash happened Sunday about 60 miles west of Phoenix.
Cook says the driver of the semitrailer truck and his wife were taken to a hospital.
Cook says the vehicles caught fire after the force of the crash pushed them into a culvert.
At least seven people were in the van. The identities and hometowns of those who died in the crash weren't immediately released.
Cook says the van was registered to someone from western Arizona.
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