Muhammad Khan, the owner of the convenience store, released surveillance video to KETK. It shows a man in a white coat with a fuzzy hood, later identified by police as Thompson, bind cashier Linda Camire and Della Witt-Denizeri, a customer, the Palestine Herald-Press reported.
Thompson then allegedly poured lighter fluid on the women and lit Witt-Denizeri, on fire, KLTV reported.
Harvey said Camire was able to help Witt-Denizeri remove her burning shirt, the television station reported. Witt-Denizeri was taken to an area hospital and then moved to a Dallas facility for treatment, KLTV reported.
"She did suffer some burns around her head and her hair was burned," Harvey told the Star-Telegram. "She was able to put out the flames before they became life-threatening.
Thompson allegedly left with between $700 and $800 in cash, Khan told KLTV.
Thompson was arrested at 5 p.m. Thursday at another convenience store in Palestine, the Palestine Police Department said in its release.