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.

U.S. Ambassador Ken Salazar has rejected accusations by Mexico’s president that the U.S. shares some responsibility for cartel violence in Sinaloa state.

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.

Mexican President Andrés Manuel López Obrador is demanding that former secretary of public security Genaro García Luna, who was convicted on drug trafficking charges in the United States last year, present evidence to support his accusations that the president has links to drug trafficking.

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.

It was surprising when Mexico's most-wanted drug lord landed at an airfield near El Paso, Texas in July.

A Mexican drug lord who was arrested in the U.S. last month could be headed to trial in New York City.

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.