Americans are remembering 9/11, 21 years after the deadliest terror attack on U.S. soil. (Sept. 11) 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/15dc2d7bc8f54e38ac19e7b09e0483e5