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A gun used during the deadly kidnapping of four U.S. citizens in Mexico has been linked to a South Texas man. Federal investigators arrested Roberto Lugardo-Moreno last weekend on charges that he illegally bought and sold guns to organizations like the Gulf Cartel. A gun used during the kidnapping in Matamoros was traced back to Lugardo-Moreno through its serial number. He made his first appearance in U.S. District Court in Brownsville yesterday. Two Americans died and two others were injured earlier this month after they crossed the border for a medical procedure.