Seized Phone Key To Drug Lord Capture

(Undated) -- A seized cell phone is being credited for the take down of Mexico's most wanted drug lord. Mexican and U.S. agents arrested Joaquin "Chapo" Guzman on Saturday. A senior U.S. law enforcement official says a phone that belonged to the son of Guzman's deputy in the Sinaloa Cartel was a big break in the case. The deputy, Ismael Zambada, could now be in line to take over the Sinaloa Cartel. His son, Serafin Zambada-Ortiz was arrested last November when he tried to cross into the U.S. from Mexico.