Originally Published: October 23, 2016 3:30 p.m.
Updated as of Monday, October 24, 2016 12:30 AM
The Arizona Department of Public Safety was investigating a 24-car pileup Sunday afternoon on southbound Interstate 17, just north of Black Canyon City.
The collision, which occurred at milepost 246, was the result of a semi tractor-trailer hauling cattle that rear-ended and side-swiped 23 passenger vehicles, when the driver was unable to stop, said Raul Garcia, public information officer for the Arizona Department of Public Safety.
The southbound lanes at Sunset Point were closed after the 1:22 p.m. crash with traffic being rerouted in the area, causing long delays on the interstate.
The Arizona Department of Transportation was advising motorists to select an alternate route, if possible. Prescott-area law enforcement reported traffic increasing on Highway 69 into Prescott as a result.
Four people suffered moderate to serious injuries when the commercial truck failed to slow down and stop for the congested traffic, Garcia said. They were flown by air ambulance to Phoenix-area hospitals for treatment. Thirteen others were taken to hospitals via ambulance.
State troopers and detectives were working to determine the reason why the driver, and the truck, failed to slow and stop in the lineup of traffic, he said.
The interstate reopened at Highway 69 just before 10 p.m., with ADOT warning drivers of slow going.
The cattle in the trailer were uninjured.