New York's World Trade Centre has reopened for business, 13 years after the 9/11 terrorist attack.

The 104-storey skyscraper dominates the Manhattan skyline.

Publishing giant Conde Nast has become the first commercial tenant in America's tallest building, beginning work at One World Trade Center on Monday.

More than 2700 people died at the site on September 11, 2001 when hijacked airliners were crashed into them.