U.S. says it 'infiltrated' the Sinaloa drug cartel in the fight against fentanyl

New U.S. Justice Department indictments contain this image of armed gang members allegedly associated with the Chapitos network of the Sinaloa cartel. (U.S. Justice Department)

U.S. officials say they've identified and infiltrated the Mexican drug organization that's largely responsible for the fentanyl crisis killing tens of thousands of Americans every year.

In a sweeping series of indictments targeting two dozen leaders and kingpins, the Justice Department blamed much of the carnage on the Chapitos network, a faction of the Sinaloa drug cartel.