MEXICO CITY, Mexico (CNN) -- Two Mexican federal officers involved in the drug fight and one of their bodyguards were shot dead and two others were wounded Thursday as they ate lunch in a restaurant in the capital, federal officials said.
The incident occurred about 3 p.m. (1800 GMT), when a black car drove up to the restaurant near the capital's historic center and a man got out and entered the restaurant, fired, then got back into the car, which drove off, witnesses said.
Among the dead were Igor Labastida Calderon, the nation's second-highest ranking federal police officer, and his bodyguard, Jose Maria Ochoa, said a spokesman for the Interior Ministry.
The agent had been a top lieutenant to Edgar Millan, and was in charge of the trafficking and smuggling unit of the Federal Preventive Police (PFP). Authorities say they believe Millan's death last month in Mexico City also was the work of the drug cartel.
The killings occurred the same day that Mexico confirmed the extradition to the United States of Benjamin Arellano Felix, who has already been sentenced to 20 years in prison in Mexico for his role as a top leader of the Tijuana drug cartel. There was no indication that the two events were linked.