LAVACA COUNTY, Texas -

Investigators are trying to figure out what caused an oil rig explosion near Victoria, Texas.

Houston-based EOG resources operates the well.

Workers were drilling into the Eagle Ford when something went wrong, sending crew members scrambling for cover.

A spokesperson for EOG says all of the workers made it off the rig safely.

Firefighters and private contractors are working to extinguish the flames.

The fire is expected to burn for a couple of days.