The investigation into the crash that caused the death of four college students continued Monday as investigators with the National Transportation Safety Board worked to collect evidence.

The investigation into the crash that caused the death of four college students continued Monday as investigators with the National Transportation Safety Board worked to collect evidence.


"We are just beginning the investigation," NTSB Board Member Robert Sumwalt said during an press conference Monday. "We’ve done a lot so far, but we still have a lot to do."


Sumwalt said both the NTSB and the Oklahoma Highway Patrol are conducting independent, but cooperative investigations into the cause of Friday’s accident.


Around 9 p.m. Friday a semi-truck travelling northbound on Interstate 35 near Davis, Okla. crossed the median and struck the bus carrying the North Central Texas College softball team.


Four students — Jaiden Pelton, 20, of Telephone; Katelynn Woodlee, 18, of Windom; Brooke Deckard, 20, of Blue Ridge, and Meagan Richardson, 19, of Wylie — were all killed. Another 11 students and Coach Van Hendrick, who was driving the bus, were also injured. The Associated Press reported that Bailey Buchanan, 18, was listed in good condition and 19-year-old Rachel Hitt remained in fair condition as of Monday afternoon. The two women are the only team members who remained hospitalized.


Sumwalt said the Oklahoma Department of Transportation, OHP and Federal Motor Carrier Safety Administration were all parties in the investigation. The FMCSA is looking into the driving records of the truck driver, Russell Staley, 53, of Saginaw, Texas, and the records for, Quickway Carriers, the company Staley worked for.


Sumwalt said the NTSB is seeking a subpoena for the medical records of the driver, and has requested an interview Staley through his attorney. Both, he said, are standard practice for the NTSB.


Sumwalt said the semi-truck appeared to have missed a curve in the roadway and instead continued straight across the median. Investigators estimate that the truck travelled about 950 feet before colliding with the bus, said Sumwalt. The truck then continued for an additional 300 feet before stopping after it collided with some trees, said Sumwalt in press conference on Sunday.


Sumwalt said there were no signs the truck attempted to swerve or initiate "evasive maneuvers" before the accident occurred.


While investigators initially reported that the truck travelled about 820 feet before colliding with the bus, Sumwalt said the new estimate included changes in altitude and other factors and is a better estimate.


The truck appeared to be travelling at the speed limit of 70 miles per hour at the time it left the roadway, he said. Sumwalt did not have an estimate of the speed of the truck when it struck the bus, but said investigators would be working to determine that.


Staley has not made any comments to the NTSB, and declined to comment when reached by the Associated Press on Monday. According to the AP, Staley told the OHP he was distracted by something inside the truck, but investigators have not released any more details.


Sumwalt said the NTSB investigation will focus on the safety aspects that lead to the accident, in hopes that a similar incident can be prevented. Sumwalt said investigators will likely be on the scene for the remainder of the week, and the investigation could take months to conclude.


"We want to make sure these four lives were not lost in vain," he said.