According to NBC News, there were other inmates and two other officers on the bus. One of the officers was the driver and the other was seated in the back. Apparently, Lopez was being transported so he could go to a medical appointment.
The escape happened in a rural area, between Houston and Dallas, Lopez was last seen running away from the bus in a field.
Facebook/Evansville Police Department
Of course, the Lopez escape comes just days after Casey and Vicky White were discovered by authorities. Vicky, a prison guard, assisted Casey in his escape from an Alabama prison ... but shot herself when authorities caught up to them, dying from her injuries. Casey White is in custody.