WASHINGTON — Ismael “El Mayo” Zambada, a historic leader of Mexico’s Sinaloa cartel, and Joaquín Guzmán López, a son of another infamous cartel leader, were arrested by U.S. authorities in Texas on Thursday, the U.S. Justice Department said.

A leader of the powerful Sinaloa cartel for decades alongside Joaquín “El Chapo” Guzmán, Zambada was known for running the cartel’s smuggling operations while keeping a lower profile....

...Zambada and Guzmán López are facing multiple charges “for leading the cartel’s criminal operations, including its deadly fentanyl manufacturing and trafficking networks," Attorney General Merrick Garland said.

“Fentanyl is the deadliest drug threat our country has ever faced, and the Justice Department will not rest until every single cartel leader, member, and associate responsible for poisoning our communities is held accountable,” Garland said in a statement...