Mexico drug kingpin pleads not guilty to US charges

Alleged Mexican kingpin Ismael "El Mayo" Zambada has pleaded not guilty to US drug trafficking charges after he and a son of another prominent Mexican drug lord were arrested in a dramatic achievement for US law enforcement that could usher in a seismic shift to Mexico's criminal landscape.

Court records showed that Zambada on Friday waived his right to appear personally in court and directed that a not guilty plea be entered on his behalf.

He was ordered detained without bond and is scheduled to be arraigned before US Magistrate Judge Anne Berton next Wednesday, the records showed. His lawyer did not immediately respond to requests for comment.

Zambada is one of the most consequential traffickers in Mexico's history and co-founded the Sinaloa Cartel with Joaquin "El Chapo" Guzman, who was extradited to the US in 2017 and is serving a life sentence in a maximum security prison.

Both Zambada and Joaquin Guzman Lopez, a son of El Chapo, face multiple charges in the United States for funneling huge quantities of fentanyl and other drugs to US streets. Fentanyl overdoses have surged to become the leading cause of death for Americans between the ages of 18 and 45.

Zambada, who is believed to be in his 70s, and Guzman Lopez, who is in his 30s, were detained after landing in a private plane in the El Paso area on Thursday.

On Friday, US President Joe Biden heralded the arrests and vowed to continue combating drug trafficking.

"Too many of our citizens have lost their lives to the scourge of fentanyl. Too many families have been broken and are suffering because of this destructive drug," he said in a statement.

Guzman Lopez lured Zambada to the US, according to three current and former US officials familiar with the operation who sought anonymity to speak candidly about the events.

US authorities have made drug bosses key targets, frequently striking plea bargain deals with them in exchange for information that leads to the capture of other high-ranking cartel figures.

Reuters could not immediately confirm a plea bargain deal had been struck, but if Zambada was betrayed by Guzman Lopez it could have major ramifications for the Sinaloa cartel - and violence more generally in Mexico.

A bloody inter-cartel war erupted in 2008 when another senior Sinaloa leader was detained. His family members accused El Chapo of orchestrating the arrest with Mexican authorities, triggering a violent fissure between two powerful factions of the crime group.

Guzman Lopez is one of four sons of El Chapo - known as Los Chapitos, or Little Chapos - who inherited their father's faction of the cartel. His brother, Ovidio Guzman Lopez, was arrested last year and extradited to the US.

Rumours on social media had circulated that Ovidio Guzman had been released, but the US ambassador to Mexico, Ken Salazar, said in a statement that he "remains in custody in the United States".

In recent years, the Sinaloa cartel has become the biggest target for US authorities, who have accused the crime syndicate of being the biggest supplier of fentanyl to the US

The Sinaloa cartel traffics drugs to more than 50 countries around the globe and is one of the two most powerful organised crime groups in Mexico, according to US authorities.

Zambada and El Chapo's sons belong to two different generations of traffickers, with differing styles.

Zambada is known for being an "old-school" narco, avoiding the limelight and operating in the shadows. El Chapo's sons, by contrast, have a reputation for being flashy narcos who courted attention as they ascended the ranks of the cartel.

El Chapo's sons are also known to be more violent and hot-headed than Zambada, who had a reputation as a shrewd operator.