turned streets into a war zone. vehicles set on fire to keep the authorities out. the police eventually letting el chapo s son go. and tonight, mexico s president is defending that decision. here s stephanie ramos. reporter: this is the deadly and chaotic gun battle erupting in the mexican city of culiacan after the mexican government says the national guard and army attempted to arrest el chapo s son, ovidio guzman lopez. authorities say a heavily armed drug cartel ambushed the military and police. spraying them with bullets. this journalist filming as deafening gunfire rings out around him, taking cover behind his news van. masked gunmen paralyzing the city, lighting cars on fire to keep police back. women and children running for cover. the situation so out of control, authorities retreated and suspended the operation. at least eight killed. nearly two dozen wounded. guzman s father el chapo is serving life in prison in the