However, his brother Osiel Cárdenas Guillén disapproved the existence of this mercenary group, since he had created Los Zetas, the parallel version of Los Escorpiones, and they had turned against the organization. "El Universal" reported that Mexican authorities identified the gunmen that were engaging in confrontations against the troops in Matamoros, Tamaulipas as members of the Los Escorpiones group. Along with Antonio Cárdenas, the following members of Los Escorpiones were killed: Sergio Antonio Fuentes, alias "El Tyson" or "Escorpión 1"; Raúl Marmolejo Gómez, alias "Escorpión 18"; Hugo Lira, alias "Escorpión 26"; and Refugio Adalberto Vargas Cortés, alias "Escorpión 42". The arrests of Marco Antonio Cortez Rodríguez alias "Escorpión 37" and of Josué González Rodríguez alias "Escorpión 43"—the two who were hospitalized after the shootout of 5 November 2010—allowed for the Mexican forces to understand the structure of Los Escorpiones.