Authorities in northern Montana say five people were killed and two more injured when the driver of a pickup truck lost control and rolled the vehicle.

Names of the victims in the Sunday morning crash near Browning have not yet been identified.

The Montana Highway Patrol says the truck was driven by a 28-year-old man from Babb. The other victims included one male and three females, all between the ages of 17 and 24 years old. The male passenger and two of the females were from Browning.

Two more passengers were treated for injuries and released.

The cause of the crash remains under investigation. But authorities say speed was a factor and that none of the seven people inside the truck were wearing seatbelts.

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