U.S. Ambassador Ken Salazar has lashed out at Mexico's failure to accept aid in the fight against drug cartels, claiming the country "closed the doors" on security cooperation.

A longtime leader of Mexico’s Sinaloa cartel who is facing drug trafficking charges in a U.S. court appeared for the first time before the judge presiding over the case.

Assailants have fired a dozen gunshots at a building housing the newspaper El Debate in the embattled northern state of Sinaloa.

Cellphone chats have become death sentences in the continuing, bloody factional war inside the Sinaloa drug cartel.

Mexican President Andrés Manuel López Obrador has blamed the United States in part for the surge in cartel violence terrorizing the northern state of Sinaloa which has left at least 30 people dead in the past week.

At least 30 people have been killed in the past two weeks in Mexico’s northern state of Sinaloa as two factions of the powerful Sinaloa cartel continue to clash.

Longtime drug cartel leader Ismael “El Mayo” Zambada has pleaded not guilty to U.S. narcotics trafficking charges.

A federal judge says that a powerful Mexican drug cartel leader who was arrested over the summer in the U.S. can be transferred from Texas to New York to face charges there.

Court documents show that Mexican drug cartel leader Ismael “El Mayo” Zambada has agreed to be transferred from El Paso, Texas, to New York, to face charges there.

Prosecutors in Mexico are suggesting U.S. authorities made a deal with a Mexican drug lord who turned in himself and another capo to get his brother transferred out of a U.S. prison.

The strange saga of how two Mexican drug lords were detained after landing in a plane in the United States in July just got stranger.

The murders of about a dozen people in the northern Mexico state of Sinaloa appear to be linked to cartel infighting, something authorities had feared would follow the July 25 detention of two top cartel leaders.

The United States managed to arrest Mexico’s most-wanted drug lord, but Mexican prosecutors — and the president — now say they are considering bringing treason charges against those who handed him over.

Mexican drug lord Ismael “El Mayo” Zambada has said that he was ambushed and kidnapped when he thought he was going to meet the governor of the northern state of Sinaloa.

The U.S. ambassador to Mexico has confirmed that drug lord Ismael “El Mayo” Zambada was brought to the United States against his will when he arrived in Texas in July on a plane along with fellow drug lord Joaquín Guzmán López.

A powerful Mexican drug cartel leader has made his second appearance in federal court in Texas after being taken into U.S. custody last week.

A son of notorious drug kingpin “El Chapo” has pleaded not guilty to drug trafficking and other charges in a Chicago courtroom days after an astonishing capture in the U.S. Joaquín Guzmán López was dressed in an orange jumpsuit and shackled at the feet Tuesday as federal prosecutors detailed a five-count indictment including drug trafficking and weapons charges.

The lawyer of a powerful Mexican drug cartel leader who is now in U.S. custody is pushing back against claims that his client was tricked into flying into the country.

The lawyer of a powerful Mexican drug cartel leader who is now in U.S. custody is pushing back against claims that his client was tricked into flying into the country.

The U.S. Justice Department says Ismael “El Mayo” Zambada, a longtime leader of Mexico’s Sinaloa cartel, and Joaquín Guzmán López, a son of another infamous cartel leader, have been arrested by authorities in Texas.

The U.S. Justice Department says Ismael “El Mayo” Zambada, a longtime leader of Mexico’s Sinaloa cartel, and Joaquín Guzmán López, a son of another infamous cartel leader, have been arrested by authorities in Texas.