© Licensed to London News Pictures. 17/03/2015. London, UK. US Ambassador, Matthew Barzun speaks at a special ceremony to unveil a steel sculpture crafted out of the 9/11 Twin Towers’ steel wreckage at the Queen Elizabeth Olympic Park in Stratford today. The artwork by American artist, Miya Ando commemorates the 10th anniversary of the 9/11 attacks and stands at 28 feet tall and weighs over 4 tons. Photo credit : Vickie Flores/LNP