Families remembered their loved ones 20 years after the 9/11 terror attacks in the US, with grieving relatives vowing to "never forget" those who lost their lives.

Six moments of silence were observed in New York City to mark the moments when four commercial planes crashed and when the the two World Trade Center towers crumbled, killing nearly 3,000 people.

The planes had been hijacked by terrorists on the morning of 11 September 2001.

SUBSCRIBE to our YouTube channel for more videos: http://www.youtube.com/skynews

Follow us on Twitter: https://twitter.com/skynews and https://twitter.com/skynewsbreak

Like us on Facebook: https://www.facebook.com/skynews

Follow us on Instagram: https://www.instagram.com/skynews

Sky News videos are now available in Spanish here/Los video de Sky News están disponibles en español aquí https://www.youtube.com/channel/skynewsespanol

For more content go to http://news.sky.com and download our apps:

Apple https://itunes.apple.com/gb/app/sky-news/id316391924?mt=8

Android https://play.google.com/store/apps/details?id=com.bskyb.skynews.android&hl=en_GB