Police authorities are currently investigating the circumstances surrounding a prison bus-freight train accident in Penwell, Texas that happened on January 14, NBC DFW reported.

According to Department of Criminal Justice spokesman Jason Clark, the prison transport bus was on its way to the Sanchez prison in El Paso from the Middleton prison in Abilene at around 7:30 a.m. when it skidded off the roadway in Penwell, sliding down an incline and colliding with a passing freight train.

Eight prisoners and two correctional officers were killed in the wreck, the Texas Department of Criminal Justice confirmed in a statement.

Jason Heaton, agency director for the region, said only the driver’s seat had a seat belt.

The prison bus collided with a Union Pacific freight train, whose four locomotives and 58 cars did not derail due to the crash; two containers at the rear of the train, however, were damaged, railroad spokesman Mark Davis said.

The Union Pacific employees were not harmed in the incident.