NBC NEWS - (NBC News) Federal investigators are working around the clock at the site of the tragic weekend bus crash near Palm Springs, California, studying what is left of a tour bus and the tractor-trailer it slammed into Sunday morning.
The violent crash claimed the lives of at least 13 people, also leaving more than 30 others injured.
The force of the accident was so great that the bus ended up smashing around 15-feet into the truck's trailer.
Federal records show that the USA Holiday bus had a satisfactory safety record.
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