The leader and co-founder of Mexico’s notorious Sinaloa cartel, along with a son of Joaquin “El Chapo” Guzman, were arrested Thursday by the FBI, federal authorities announced.

The Justice Department confirmed that Ismael “El Mayo” Zambada and Joaquin Guzman Lopez were arrested in El Paso, Texas. One senior official familiar with the arrest told CBS News that Zambada was taken into custody by the FBI without incident along the U.S. border.