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In the videotaped interrogation, first reported by the Los Angeles Times, Rejon Aguilar, a former member of an elite Mexican paratroop and intelligence battalion known as the Special Air Mobile Force Group, told Mexican police, “Whatever you want, you can get” from the U.S.

Mr. Grassley noted that it has been “well documented” that hundreds of guns may have crossed the border into Mexico because of the “reckless policy known as Fast and Furious,” but the hundreds of thousands of guns used by Mexican drug cartel members are not primarily from U.S.-based gun dealers.

Instead, he said, evidence shows that other sources, including some in Central America, help supply the weapons.

Rejon Aguilar was taken into custody Sunday in the Mexico City suburb of Atizapan “without firing a shot,” according to Mexican federal police. He was one of Mexico’s most-wanted men, and the U.S. Justice, State and Homeland Security departments had announced a reward of up to $5 million for his arrest and conviction.

Mexican police said he was “connected to the attack” in the daylight ambush in Mexico of Zapata and his partner, ICE Agent Victor Avila Jr., who was wounded. They said Rejon Aguilar was in charge of operations for the Zetas in San Luis Potosi when the American agents were ambushed.

Neither of the U.S. agents was armed, as the Mexican government does not allow U.S. law enforcement personnel to carry weapons.

More than two dozen Zetas have been arrested in the case. They include Julian Zapata Espinoza, identified as the gang’s cell leader in San Luis Potosi, and the gang’s suspected paymaster, Mario “El Mayito” Jimenez.