The shootings come as the federal government announces the beginning of the "demobilisation" of the vigilante "self-defense" movement, which rose up a year ago to fight the cartel's extortion demands.
Prosecutors in western Michoacan state confirmed today that the five dead belonged to a pseudo-vigilante group that had been financed by the gang to stem the advance of the self-defense movement.
Federal police officers said the shootings occurred on the outskirts of the seaport of Lazaro Cardenas, as the self-defense forces tried to push further into the city.