NBC Nightly News Full Episode - Feb. 6

♪♪ >>> TONIGHT, WE'RE LIVE IN SAN FRANCISCO WITH THE MASSIVE SECURITY OPERATION AHEAD OF THE SUPER BOWL. >>> PLUS THE WINTER OLYMPIC GAMES OFFICIALLY UNDER WAY. >>> WE HAVE BREAKING NEWS NOW IN THE SEARCH FOR NANCY GUTHRIE.POLICE NOW POSSIBLY LOOKING FOR A VEHICLE. THE NEW MESSAGE REGARDING SAVANNAH GUTHRIE'S MOTHER JUST RECEIVED, WHAT WE KNOW NOW. NEW VIDEO FROM SAVANNAH'S BROTHER AND MORE ON A POSSIBLE NEW LEAD.>>> THE WORLD UNITING AS THE OLYMPIC GAMES OFFICIALLY BEGIN. HIGHLIGHTS FROM THE OVER-THE-TOP O ...