But the Tijuana killings raised a particular alarm because federal and local authorities have said that the city, where beheadings of police officers and other atrocities by drug gangs were common a couple of years ago, seemed to be turning a corner as a result of close cooperation among the military and the local police.
At a two-week conference this month in Tijuana to promote and encourage investment, President Felipe Calderón held the city up as a “clear example that the security challenge has a solution.”
The annual number of murders there came down in 2009 from a high of more than 800 two years ago. But, not counting the latest violence, there have been 639 killings this year, on a pace to match or surpass the 695 of last year. Analysts of the fight against drugs have questioned whether the city had achieved a relative peace or simply reached a lull.
A couple of headless bodies were found hanging from a bridge several miles away from the conference while it was in session.
As Mexico burned the 134 metric tons of marijuana seized last week, local journalists who follow the drug war speculated that the loss of so much marijuana would not go unpunished.
Rommel Moreno, the state prosecutor, said that was one explanation the authorities were considering for the attack.
The police said armed men stormed the drug rehabilitation center. Centers like that one frequently become targets in Mexico because drug gang members often seek treatment or hide in them.
In Ciudad Juárez, such clinics have been attacked repeatedly, and after the killings in Tijuana an unknown voice was heard over police radios saying, “This is a taste of Juárez,” in what the authorities saw as a threat. It appears the victims were lined up face down on the floor and shot with automatic weapons.
Frontera, a local newspaper, said the clinic was not registered with state medical authorities and appeared to be “clandestine.”
Either way, the killings were seen as a setback for a city where bars, restaurants and art galleries were once again attracting crowds, though Americans still largely keep away.
“It is something really troubling, above all since various authorities say we are among states that, in terms of security, have advanced and done it strongly,” Edmundo Guevara Márquez, president of the Business Coordinating Council, told reporters.
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