The state issued an alert Wednesday. The skimmers were found at the Edge Mart, located at 21411 Clay Rd.
Harris County deputies have since removed and seized the devices.
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Two weeks ago, officials say an inspector found skimmers on six out of eight pumps at the Valero on the North Loop at Wayside.
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If you think you've been skimmed, call 1-800-TELL-TDA. TDA will send an inspector to check it out.