Official: Weapon used in attack on ICE agent came from U.S.

A weapon that was used in the fatal attack on a U.S. immigration agent in Mexico originated in the United States, Mexico's state-run Notimex news agency reported, citing a U.S. official.

Agents with the Bureau of Alcohol, Tobacco, Firearms and Explosives arrested three men in a Dallas suburb Monday in connection with the purchase of weapons that were smuggled into Mexico, ATF spokesman Tom Crowley told Notimex.

U.S. Immigration and Customs Enforcement agent Jaime Zapata was killed and another agent injured when they were ambushed on a highway in the Mexican state of San Luis Potosi last month.

One of the weapons used by the drug cartel members who attacked the agents was purchased by one of the men arrested in Texas, Crowley said.

"The weapon was used in the attack, it was fired at the location, but we don't know if one of those bullets struck or killed Zapata," he said.

Crowley declined to give specifics on what type of weapon it was, Notimex reported.