the terror attack at the major airport in istanbul, tourry, the city a popular tourist destination for americans. now what may be the first video of the attack. images hitting the internet showing what appears to be one of the three attackers detonating an explosive device at the terminal. at least three dozen dead, more than 140 injured. no word yet on who did this. turkish officials and others are looking closely at isis tonight. americans in turkey are urged to let loved ones know they are safe via social media. we will be updating this story all night on abcnews.com and much more first thing in the morning on "gma." >>> we move on to the story of a towering and ground-breaking figure in the world of sports. pat summitt has died. abc's robin roberts who had a special relationship with the coach looks back tonight. >> reporter: a legendary, unstoppable force. a pioneer in women's sports. and a fierce competitor. >> i don't know about y'all but i want to win a national championship. >> reporter: pat summitt coached the university of tennessee's lady vols to eight national championship