pat summerall has died. summera all went behind the mike after playing ten years in the nfl. he will be most fondly remembered for long time air partnership with john madden. yesterday madden said summerall was the voice of football. and always will be. he called 16 super bowls, the last one was in 2002. pat summerall died of cardiac arrest yesterday in texas. he was 82 years old. he was the voice of football. he was fantastic. when we return, a nation on edge. how cities across the country are beefing up security to keep people safe. you are watching world news now. announcer: world news now continues after this from our abc stations.