MEXICO CITY — The killing of a U.S. Immigration and Customs Enforcement agent and wounding of another in Mexico highlights the risk for American officials helping with Mexico's crackdown on organized crime under increasing cooperation between the two countries.

Special Agent Jaime Zapata, on assignment to the ICE Attache in Mexico City from his post in Laredo, Texas, died Tuesday when gunmen attacked the agents' blue Suburban vehicle as they drove through the northern state of San Luis Potosi.

The second agent, who wasn't identified, was shot in the arm and leg and was in stable condition, according to statements from the Department of Homeland Security.

Homeland Security Secretary Janet Napolitano said the fatal attack on American law enforcement, the highest-profile since the 1985 torture and killing of DEA agent Enrique “Kiki” Camarena, won't change the U.S. commitment to supporting Mexico in its crackdown on organized crime.