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The mob broke into a government building in Magdalena Tequisistlan, seized the officer and threw him from the third story, then doused him with gasoline and lit the fuel, according to the Oaxaca state attorney general's office.

The officer reportedly shot a taxi driver Friday in a bar argument and was taken into custody in the town, 290 miles southeast of Mexico City.

The killing came amid heightened concerns about vigilante justice in Mexico, where people view police as inept or corrupt and say they must take security into their own hands.

The attack in Oaxaca state resembled a November killing in Mexico City when an angry crowd beat and burned alive two plainclothes federal agents and injured a third. The killings were captured on live television long before riot police arrived.

President Vicente Fox responded by firing Mexico City's police chief and a top federal law official, blaming the capital city's government for tolerating vigilantism. Dozens of people have been arrested in that attack.