MEXICO CITY- Mexican soldiers have arrested an alleged Zetas drug cartel member who allegedly confessed to killing a U.S. immigration agent, but said the attack was a case of mistaken identity.

Suspect Julian Zapata Espinoza – known by the nickname “El Piolin,” or Tweety Bird, apparently because of his short stature – told soldiers that a group of gunmen from the Zetas mistook the officer’s vehicle for one used by a rival gang.

U.S. Immigration and Customs Enforcement agent Jaime Zapata was shot to death and fellow agent Victor Avila was wounded while driving on a highway near the northern city of San Luis Potosi on Feb. 15.

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