In the heartland of Mexico’s Sinaloa cartel, the old ways have changed and violence rages The Associated PressWhy cellphone chats have become death sentences in cartel stronghold in Mexico CBS NewsA Cartel Double-Cross Turns a Mexican State Into a War Zone The New York TimesNarco Violence Leaves 200 Dead in Mexico’s Sinaloa in Grim Month BloombergThe Take: El Chapo’s sons clash with rival cartel in Sinaloa showdown Al Jazeera English