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MEXICO CITY (AP) _ Mexican marines and police have arrested a man authorities describe as a leading cocaine trafficker for Mexico’s Sinaloa drug cartel.

Mexico’s National Security Commissioner says Cesar Gastelum Serrano was arrested in the resort city of Cancun.

Monte Alejandro Rubido said Sunday that Gastelum Serrano was carrying a pistol and a package of cocaine.

The U.S. Treasury Department placed Gastelum Serrano on its drug kingpin list in December. It called him “one of the most prolific cocaine suppliers for Mexico’s Sinaloa Cartel.”

The department said he headed “a vast criminal network to lead a cocaine trafficking organization capable of moving tons of cocaine per week through Honduras and Guatemala to Mexico. “

Rubido said Gastelum Serrano had operated in Honduras, and had ordered the killing of law enforcement officials there.