Mexico City Mayor Miguel Angel Mancera said yesterday that three men got into a police station over the weekend posing as relatives and the lawyer of a detainee, who has been identified as Carlos Esquivel Orozco.
The gang then opened fire inside the police station and fled with the suspect, who had been caught with an assault rifle.
One assailant was killed in the Sunday shootout at the police station, and the suspect who escaped briefly and another one of the other gunmen were captured.
The cartel shocked Mexico on May 1 with coordinated attacks in the western state of Jalisco that forced down a military helicopter and killed 18 people.
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The death toll rose over the weekend after another army officer died, bring the death toll to eight soldiers, two police officers and eight suspected gunmen. Four soldiers and a federal police officer are still being treated for injuries suffered after the chopper was struck by a rocket-propelled grenade.
Mancera said the violence does not mean the Jalisco cartel is extending its area of operations into the nation's capital.
"Mexico City is in no way an area where this type of operation is easy" for the cartels, Mancera said.
In the past, the city has largely been spared the grisly drug violence hitting other states, even though officials have acknowledged that drug capos do use the city as a point of transit and place of residence.