Protesters storm U.S. embassy in Baghdad after airstrikes, Australian wildfires lead thousands to seek refuge on the beach, and authorities say the mother of missing Idaho siblings refuses to cooperate. Watch “NBC Nightly News With Lester Holt” at 6:30 p.m. ET / 5:30 p.m. CT (or check your local listings). 1:27 U.S. Embassy In Iraq Under Siege, As U.S. And Iran Tensions Escalate 3:23 N.Korean Leader Kim Jong Un Warns Of 'New Strategic Weapon' 4:02 Two Dead After Small Plane Crashes At Kansas City AirPort 4:18 High Security In Times Square Ahead Of New Year’s Eve Celebration 5:29 New Year's Eve Brings Heavy rain To Northwest, Snow To Great Lakes 5:47 Australian Fire Emergency Forces Urgent Evacuations, Threatens Wildlife 7:39 Two Republicans Critical Of Mcconnell Ties To W.H. Ahead Of Impeachment Trial 9:16 Growing Mystery After Siblings Reported Missing For Months In Idaho 10:57 Dramatic Florida Boat Rescue Caught On Camera 12:38 2020 Rings In New Laws, Including A New I.D. That Could Snarl Travel 15:03 Army Bans The Use Of Tiktok On Military Phones, Citing Security Concerns 16:33 40-Year-Old Cold Case Mystery Solved Using DNA Found In A Cave » Subscribe to NBC News: nbcnews.to/SubscribeToNBC » Watch more NBC video: bit.ly/MoreNBCNews Connect with NBC Nightly News online! NBC News App: smart.link/5d0cd9df61b80 Breaking News Alerts: link.nbcnews.com/join/5cj/breaking-news-signup?cid=sm_npd_nn_yt_bn-clip_190621 Visit NBCNightlyNews.com: nbcnews.to/2wFotQ8 Find Nightly News on Facebook: bit.ly/2TZ1PhF Follow Nightly News on Twitter: bit.ly/1yFY2s4 Follow Nightly News on Instagram: bit.ly/2tEncJD 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. NBC Nightly News Broadcast (Full) - December 31st, 2019 | NBC Nightly News