No fatalities were reported and the number of injured was not disclosed inside the Allen Premium Outlets mall, located 25 miles northeast of Dallas.
Footage released by local media showed police rushing shoppers out of the mall, with police cars and emergency vehicles parked near the entrances.
Mass shootings have become commonplace in the United States, and the number of such incidents has reached at least 198 so far this year, the highest number since 2016.
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