The New York Times adds that, although drug gangs have distanced themselves from the attack, it signals a dangerous new phase of the violence.
La Familia, a violent drug gang based in Michoacán that the authorities have suggested might be responsible, has gone to extraordinary lengths to distance itself from the unprecedented attack on innocents, which has long been considered ungentlemanly behavior among cartel killers....
But with no note by the killers to go on, the authorities consider the brazen attack to be a sign that all bets in the drug war may be off.
Following the grenade attack, President Felipe Calderón has promised even more crackdowns, according to The Arizona Republic.
In response, Calderón announced bills giving the government more power to seize drug assets and a new reward program for tipsters. He also proposed an easier process for getting search warrants and more investigative powers for police. In at least five speeches following the Morelia attacks, he urged Mexicans to stand strong.