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GARVIN COUNTY, Okla. – A large rock from a trailer caused a deadly collision in Garvin County, Oklahoma Highway Patrol says.

It happened on Tuesday, just before 5:30 p.m., on State Highway 19 and Kimberlin Rd. near Pauls Valley.

According to a trooper’s report, a semi with a tractor trailer hauling rock was driving northbound on US77 when “a large rock came out of the trailer and struck the windshield,” of a vehicle traveling southbound.

The semi driver was not injured.

In the southbound vehicle, two women were killed, 83-year-old Flora Perkins and 89-year-old Wanda Oliver, both of Pauls Valley. The driver of the vehicle was not injured.

The cause of the collision was due to “other improper act/movement; failure to secure load.”