CDC announces new mask guidance as states crack down on unvaccinated people, four police officers testify at first hearing of January 6th House select committee, American Airlines warns about jet-fuel shortages, asks pilots to conserve.   » 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. NBC News Digital features NBCNews.com, MSNBC.com, TODAY.com, 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: https://apps.nbcnews.com/mobile​ Breaking News Alerts: https://link.nbcnews.com/join/5cj/bre... Visit NBCNews.Com: http://nbcnews.to/ReadNBC​ Find NBC News on Facebook: http://nbcnews.to/LikeNBC​ Follow NBC News on Twitter: http://nbcnews.to/FollowNBC​ Follow NBC News on Instagram: http://nbcnews.to/InstaNBC​ #NBCNews #CapitolAttack #Vaccines