Heavily armed fighters surrounded security forces Thursday, and forced them to free one of drug lord Joaquin 'El Chapo' Guzman's sons. His capture triggered gunbattles and a prison break that sent civilians in Culiacan scurrying for cover.
National Guard militarized police first came under attack from within a house in the city 770 miles northwest of Mexico City. They were able to free able to free Ovidio Guzman. Culiacan is a Sinaloa stronghold.