New Surveillance Video Released In Miami Mass Shooting

New video captures bystanders outside a concert as doors of an SUV open and three gunmen approach. Miami-Dade County Mayor Daniella Levine Cava says no resource is being spared to find the assailants.  » Subscribe to NBC News: » Watch more NBC video: NBC News Digital is a collection of innovative and powerful news brands that deliver compelling, diverse and engaging news stories. NBC News Digital features , , , Nightly News, Meet the Press, Dateline, and the existing apps and digital extensions of these respective properties. We deliver the best in breaking news, live video coverage, original journalism and segments from your favorite NBC News Shows. Connect with NBC News Online! NBC News App: Breaking News Alerts: Visit : Find NBC News on Facebook: