Fights between gangs have increased since the arrest last year of Sinaloa cartel boss Joaquin 'El Chapo' Guzman At least 35 people were killed over the weekend in Mexico, according to local officials, amid a widespread surge in drug gang violence that has driven murders to a level not seen since 2011. In Sinaloa state, 12 people were killed in different incidents since the early hours of Sunday, according to local officials.