Discussions among White House, Defense Department and intelligence officials, which are still at an early stage, have included possible drone strikes against cartel figures and their logistical networks in Mexico with the cooperation of Mexico's government, the sources said.

Still, the administration has made no final decision and reached no definitive agreement about countering the cartels. And unilateral covert action, without Mexico's consent, has not been ruled out and could be an option of last resort, the sources said. It is unclear whether American officials have floated the possibility of drone strikes to the Mexican government.

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