Authorities on Friday identified four people who were killed in a collision involving semis along Interstate 10 north of Tucson.

Three of the victims were from Pittsburgh, Texas, and were riding in a minivan that was struck by a semi Thursday. They were identified by the Arizona Department of Public Safety as driver Derrick Bryan Reynolds, 46, and passengers Wendy Reynolds, 42, and Joachim Reynolds, 20.

Sierra Transportation driver Rickey Duffey, 61, of Fayetteville, Ga., also was killed. DPS said he lost control of the rig, crossed a dirt median and slammed into the minivan.

Sierra Transportation employs 75 drivers and operates an average of 39 vehicles, according to the U.S. Department of Transportation, adding that the company has a safety rating of “satisfactory.”

Those injured in the crash include semi driver Steve Murphy, 58, who was in critical condition and transferred to Maricopa Medical Center; Dennis Robinson, 56, the co-driver of the Sierra truck who was taken to the University Medical Center in Tucson; and Samuel Molina, 50, the driver of a two-door Honda sedan who also was taken to University Medical Center.