At the site of the World Trade Center in New York City, families and friends gathered for the ceremony marking the 20th anniversary of the 9/11 attacks that toppled the twin towers, killing their loved ones. #News #Reuters #September11 #NewYork #WorldTradeCenter Subscribe: http://smarturl.it/reuterssubscribe Reuters brings you the latest business, finance and breaking news video from around the globe. Our reputation for accuracy and impartiality is unparalleled. Get the latest news on: http://reuters.com/ Follow Reuters on Facebook: https://www.facebook.com/Reuters Follow Reuters on Twitter: https://twitter.com/Reuters Follow Reuters on Instagram: https://www.instagram.com/reuters/?hl=en