Mexico had filed a $10-billion suit in U.S. federal court seeking to have Smith & Wesson and other gun manufacturers held accountable for the county’s epidemic of shooting deaths.

The U.S. says it will work with Mexico “to stop southbound arms trafficking and dismantle networks fueling cartel violence.”

An estimated 200,000 to 500,000 firearms are smuggled into Mexico each year.

MEXICO CITY — More than a decade ago, Mexican authorities erected a billboard along the border in Ciudad Juárez, across the Rio Grande from El Paso.

“No More Weapons,” was the stark message, written in English and crafted from 3 tons of firearms that had been seized and crushed.

It was a desperate entreaty to U.S. officials to stanch the so-called Iron River, the southbound flow of arms that was fueling reco

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