ELK CITY, Oklahoma - The fire at a trucking company is out, Saturday night, but not before sending two people to the hospital. Now the focus turns to figuring out what went wrong.

There are still a lot of questions about the fire, but the good news is that the fire is out and crews left the scene around 7:30 p.m.

The Elk City Emergency Manager tells News 9 crews battled the fire all day. The initial call came out just before 9:30 a.m. An explosion ignited the blaze.

News 9 is told the two employees who suffered injuries worked for Hodges Trucking Company in Elk City. That company is an affiliate of Chesapeake Energy that provides trucking, cranes and maintenance services for the oilfield industry.

The employees were hurt while unloading their truck. One was flown to Oklahoma City to be treated for their injuries. No word tonight on how severe the injuries are or what condition the two employees are in.

A spokesman for Chesapeake Energy tells News 9 the company is investigating the incident to find out exactly what happened and what caused the explosion.