An accident Tuesday afternoon on State Highway 11, east of Pershing in Osage County, caused the death of a 61-year-old Tulsa man and the hospitalization of a 31-year-old Skiatook woman and three children, according to the Oklahoma Highway Patrol.

A fourth child was reportedly treated at a hospital and released.

A motorist identified as Steven David Haber, 61, of Tulsa, was pronounced dead at the accident scene, according to the OHP. He was driving a 2009 Honda Accord, the OHP said.

A second motorist, identified as Rebecca Jo McLain, 31, of Skiatook, was hospitalized. She had been driving a 2013 Dodge Durango. Hospitalized as well were three young children who had been riding with McLain, the OHP said. The hospitalized children were 9 months old, 2 years old and 6 years old, the OHP said in a trooper report.

Two children - a 6-year-old girl and a 9-month-old girl - were hospitalized in critical condition, the OHP said.

A fourth child who had been riding with McLain - a 1-year-old boy from Barnsdall - was treated at a Tulsa hospital and released, the OHP said.

The accident resulted in the closure of part of Highway 11 for more than four hours, from about 4:10 p.m. until about 8:30 p.m.

The OHP said the two vehicles collided head-on in the westbound lane of Highway 11. McLain had been driving west and Haber had been driving east, the OHP said.

Haber had been wearing a seat belt, while McLain had not been wearing one, the OHP said.

Child restraints were in use for the three youngest children, the OHP said. Investigators were still trying to determine if the 6-year-old was wearing a seat belt, the OHP said.

A half-dozen OHP troopers worked the accident, with assistance from the Osage County Sheriff’s Office.

Also responding were Pawhuska EMS, Miller EMS, Bartlesville EMS, the Barnsdall Fire Department, AirEvac and the state Medical Examiner’s Office.

The cause of the accident was still under investigation, the OHP said.