Articles:
https://www.washingtonpost.com/news/post-nation/wp/2016/09/11/on-15th-anniversary-of-911-mourners-gather-at-ground-zero/?utm_term=.d2ba94144bde
http://www.usatoday.com/story/news/nation-now/2016/09/11/their-memories-stay-alive-ceremony-honors-victims-911-terrorist-attacks/90167014/
https://www.911memorial.org/15th-anniversary
http://nypost.com/2016/09/11/how-city-will-mark-15th-anniversary-of-911/
Videos:
www.bbc.com/news/world-us-canada-37333090
www.usatoday.com/story/…/911…15th–anniversary…/88761082/
www.usatoday.com/videos/news/nation/2016/09/11/90225492/