NTSB officials say 21 crew members and two pilots were on board the cargo ship when it crashed into a bridge in Baltimore. NTSB Chair Jennifer Homendy said the vessel had at least 56 containers, or 764 tons, of hazardous materials on board as well. Officials are also reviewing six hours of analysis recovered from a voice data recorder. » Subscribe to NBC News: null 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! Breaking News Alerts: https://link.nbcnews.com/join/5cj/breaking-news-signup?cid=sm_npd_nn_yt_bn-clip_190621 Visit NBCNews.Com: https://www.nbcnews.com/ Find NBC News on Facebook: https://www.facebook.com/NBCNews Follow NBC News on Twitter: https://twitter.com/NBCNews Get more of NBC News delivered to your inbox: nbcnews.com/newsletters #Baltimore #Maryland #Bridge