Spire makes World Trade Centre tallest in the west
Construction workers watch as a 408ft spire is hoisted on to a temporary platform on the top of One World Trade Centre in New York.
The spire itself weighs 758 tonnes and when installed will make the skyscraper the tallest structure in the western hemisphere and the third-tallest in the world. The raising of the spire, which came on the second anniversary of the death of Osama bin Laden, will make One World Trade Centre 1,776ft tall.
The skyscraper is built on the site where the September 11, 2001 attacks toppled the original World Trade Centre towers.