New York Gov. George Pataki, center left, with, from left, architect Fumihiko Maki, World Trade Center Developer Larry A. Silverstein, architects Daniel Libeskind, Lord Norman Foster and Lord Richard Rogers

Three architects have unveiled plans for a trio of skyscrapers to surround the World Trade Center site in New York City, which is being turned into a memorial to victims of the September 11, 2001 terrorist attacks.

Plans for the three buildings were unveiled Thursday, designed by Britons Norman Foster and Richard Rogers and Japanese national Fumihiko Maki. The skyscrapers will flank the American-designed Freedom Tower, which will stand more than 540 meters high - the tallest building in New York.

The rebuilding of the World Trade Center site has been repeatedly delayed by insurance and security concerns, as well as arguments over the design of the memorial. Construction of the Freedom Tower is set to begin next year. The entire site is expected to be completed by 2012.

Some information for this report was provided by AP and Reuters.