The skyscraper being built on the site of New York City’s September 11, 2001 terrorist attack has reached 100 floors, the project’s owners announced earlier this week.

The building is most commonly known as the Freedom Tower but officially called One World Trade Centre.

“Steel installation for One World Trade Centre has reached the 100th floor, with four more floors to go before it reaches the top of the tower,” the Port Authority of New York and New Jersey said in a statement.

The Freedom Tower, scheduled to be opened in 2013, is being built to a height of 541 metres, which is a symbolic figure reminiscent of the US year of independence.

The glass walls have been built to the 70th floor while the concrete floors are poured to the 87th floor, the Port Authority of New York and New Jersey said on its website.

The building is planned to be the tallest in the United States when it is completed.

The skyscraper is being built alongside the 9/11 Memorial, where the World Trade Centre’s Twin Towers stood until terrorists crashed airliners into them, killing nearly 3,000 people.

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