The Russian airstrike on the theater in Mariupol on March 16 stands out as the single deadliest known attack against civilians to date. An Associated Press investigation recreated what happened finding the attack killed closer to 600 people. (May 4) Subscribe for more Breaking News: http://smarturl.it/AssociatedPress Website: https://apnews.com Twitter: https://twitter.com/AP Facebook: https://facebook.com/APNews Instagram: https://www.instagram.com/APNews/ ​ You can license this story through AP Archive: http://www.aparchive.com/metadata/youtube/9b8f804d796e45a589377f441130e811