Officials say a human head and was left near the home of the Oaxaca state attorney general with a note threatening three state officials.

State prosecutors say the head and note were found Saturday inside a plastic bag left a few yards the official's house in Oaxaca city.

The note threatened Attorney General Evencio Martinez as well as organized crime investigator Pedro Guzman and the leader of the state's governing party, Jorge Franco.

The note signed in the name of the Gulf drug cartel said officials must "learn to respect that we are here and we won't leave."

A body matching the head was found outside the city. Officials say they have not yet identified the man.