Architects have unveiled a revamped design for the skyscraper that will replace New York's World Trade Center, which was destroyed in the September 11, 2001 attacks.
Lead designer David Childs presented a plan for a new facade for the base of the 540-meter Freedom Tower, after hearing criticism that the previous design resembled a bunker.
Panels made of glass prisms will now cover the bomb-resistant concrete base. The earlier exterior design called for metal panels.
Childs says designers are still developing the new panels in order to satisfy safety concerns. The panels would shatter into tiny particles in the event of an explosion to avoid severe damage.
Builders estimate the tower will be ready for occupancy in 2010.
Some information for this report was provided by AP.