Only one federal police officer was killed in the operation yesterday, which authorities launched after learning that "armed criminals" were occupying the ranch in Tanhuato, Michoacan state, near the neighboring state of Jalisco, officials said.
"Up to now, we have counted 42 suspected criminals killed and three more detained," said National Security Commissioner Monte Alejandro Rubido.
Rubido said the death toll was a "preliminary figure," suggesting the number could rise as investigators comb the vast property.
The cartel, which has links to gangs as far away as Asia and trafficks drugs to the United States, has taken Mexican authorities head-on this year, killing 20 police officers in two ambushes in March and April.
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'On May 1, the government launched Operation Jalisco against the cartel. That same day, the gang killed seven troops and a policewoman when they downed a military helicopter with a rocket-propelled grenade.
"Warned about the presence of federal forces, the rest of the suspected criminals who occupied the property began to attack our comrades with intensity," he said.
"The clash went on sporadically for about three hours, in at least three points in the property," Rubido said, adding that a federal police helicopter was called in to back up the land forces.
The suspects dispersed into fields, "which complicated the operation," Rubido said, noting that the ranch measures 112 hectares and includes a house and a warehouse.