The U.S. official says the guards had been arrested earlier this month in a series of raids at seven houses in Culiacan, Mexico. Agents from the U.S. Drug Enforcement Administration and the Mexican military found a series of interconnected tunnels under the houses that Guzman is thought to have used to escape.
The official says Guzman is believed to have flown to the resort town of Mazatlan after the house raids. He was arrested there Saturday.
The official was not authorized to discuss details of the case by name and spoke on the condition of anonymity.