Guzmán and Palma struck back against the Arellano Félix brothers (Tijuana Cartel) with nine killings on 3 September 1992 in Iguala; among the dead were lawyers and family members of Félix Gallardo, who was also believed to have orchestrated the attack against Palma's family. Mexico's Attorney General formed a special unit to look into the killings, but the investigation was called off after the unit found that Guzmán had paid off some of the top police officials in Mexico with $10 million, according to police reports and confessions of former police officers. In November 1992, gunmen of Arellano Félix attempted to kill Guzmán as he was traveling in a vehicle through the streets of Guadalajara. Ramón and at least four of his henchmen shot at the moving vehicle with AK-47 rifles, but the drug lord managed to escape unharmed. The attack forced Guzmán to leave Guadalajara and live under a false name under fears of future attacks. He and Palma, however, responded to the assassination attempt in a similar fashion; several days later, on 8 November 1992, a large number of Sinaloa Cartel men posing as policemen stormed the Christine discothèque in Puerto Vallarta, spotted Ramón, Francisco Javier Arellano Félix, David Barron Corona, and opened fire at them. The shooting lasted for at least eight minutes, and more than 1,000 rounds were fired by both Guzmán's and Arellano Félix's gunmen. Six people were killed in the shootout, but the Arellano Félix brothers were in the restroom when the raid started and reportedly escaped through an air-conditioning duct before leaving the scene in one of their vehicles. On 9 and 10 December 1992, four alleged associates of Félix Gallardo were killed. The antagonism between Guzmán's Sinaloa Cartel and the Arellano Félix clan left several more dead and was accompanied by more violent events in the states of Baja California, Sonora, Sinaloa, Durango, Jalisco, Guerrero, Michoacán and Oaxaca.