Tributes pour out as America remembers victims 14 years later [PHOTOS]

On September 11, 2011, a group of terrorists hijacked four planes and crashed two of them into New York City's World Trade Centre, a third one into the Pentagon in Washington and a fourth on an empty field in Pennsylvania.

14 years later, Americans still continue the tradition of paying tribute to the lost souls via a series of memorials and also on social media.

Read tribute tweets below: