At one time , he was the personal bodyguard for Osiel Cardenas Guillen , the now-imprisoned leader of the Gulf cartel . Flavio Mendez Santiago was arrested Monday night in a federal police operation . The arrest came after the U.S. State Department issued an alert to American citizens about his possible links with terrorist groups. Mendez was on a list of Mexico 's 37 most-wanted fugitives .
Flavio Mendez Santiago was arrested Monday night in a federal police operation . The arrest came after the U.S. State Department issued an alert to American citizens about his possible links with terrorist groups. Mendez was on a list of Mexico 's 37 most-wanted fugitives .