However, the Beltrán Leyva brothers were involved in some double-dealing of their own. Arturo and Alfredo had met with leading members of Los Zetas in Cuernavaca, where they agreed to form an alliance to fill the power vacuum. They would not necessarily go after the main strongholds, such as the Sinaloa and Gulf Cartel; instead, they would seek control of southern states like Guerrero (where the Beltrán Leyvas already had a big stake), Oaxaca, Yucatán and Quintana Roo. They worked their way into the center of the country, where no single group had control. The Beltrán Leyva organization allied with the Gulf Cartel and its hit squad Los Zetas against Sinaloa.