Witness videos capture the terrifying scene around the mass shooting in Dayton, Ohio. People run to safety after a gunman opens fire and is intercepted by police within the span of a minute." Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC " Watch more NBC video: http://bit.ly/MoreNBCNews NBC News Digital is a collection of innovative and powerful news brands that deliver compelling, diverse and engaging news stories.