According to the Mexican Navy, at least 14 Mexican marines were killed on Friday when their helicopter crashed during the arrest and transport of a drug lord in northern Mexico.
The Black Hawk helicopter, owned by the Navy, was escorting another aircraft carrying Rafael Caro Quintero.
Quintero, founder of the Guadalajara Cartel, was arrested earlier in the day in the northern state of Sinaloa.
One person survived the crash, the cause of which has yet to be determined.
The United States is after Caro Quintero and seeks to extradite him for the murder of Enrique Camarena Salazar, an agent of the U.S. Drug Enforcement Administration (DEA), in 1985.
Produced by Xinhua Global Service