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MEXICO CITY — Arizona Gov. Janet Napolitano says there will be a thorough investigation into the shooting deaths of three illegal immigrants near Tucson, adding that the attack underscores the need for major U.S. immigration reform.

The statement came Friday as Mexican officials released a statement demanding justice for the victims, killed Thursday when gunmen chased down a truck full of illegal migrants and opened fire.

"The practice is, and I'm sure it'll be followed in this case, is to do your forensics, to interview the witnesses, to try and identify not only who the victims were but also who the shooters were and the like, and then to take appropriate law-enforcement action," Napolitano told reporters after meeting with President Felipe Calderón.

Investigators in Arizona on Friday said the attack likely came from rival smugglers. Two people, a Mexican and a Guatemalan, were also wounded in the attack.

Mexican officials said the nationalities of the three who died had not been confirmed.

"We are going to continue to have incidents at the border, albeit, I hope, not frequently," Napolitano said.

"We need the Congress of the United States to take up immigration," she said.

Arizona's border with Mexico is the busiest crossing between the two countries. Violence is increasing as smugglers vie for business amid tightened controls, U.S. officials say.

Napolitano said her meeting with Calderón, who took power in December, was "very fruitful" and that they agreed on the need to cooperate on cross-border infrastructure projects and environmental issues.

They also discussed inspecting and sealing cargo in Mexico before it arrives at the border to speed up border traffic, she said.

Calderón expressed concern about the increasingly bold activities of groups in Arizona opposed to illegal immigration.

The groups "create an adverse climate that is not conducive to broad cooperation," the president's office said in a news release.