Mexican national security forces have arrested Nestor Isidro Perez Salas, also known as "El Nini," who is believed to be the head of security for the sons of Joaquin "El Chapo" Guzman. Perez Salas, a top assassin for the Sinaloa Cartel, was apprehended in Culiacan, Mexico, and is now being sought for extradition to the United States. U.S. officials have accused Perez Salas of committing numerous crimes, including murder, torture, and kidnapping of rivals, witnesses, and others who opposed the Chapitos. He is also facing federal charges of narcotics, firearms, and witness retaliation crimes. The U.S. government had offered a $3 million reward for information leading to his capture. This arrest is seen as a significant blow to the Sinaloa Cartel and a victory for U.S.-Mexico cooperation in combating drug trafficking and violence.