The world's tallest building just got taller -- the Burj Dubai tower in the booming Gulf emirate of Dubai has now reached a height of 688 metres (2,257 feet) and is still growing, developers Emaar said on Tuesday. It now boasts 160 storeys, the highest skyscraper in the world, Emaar said in a statement. The skyscraper, set for completion in September 2009, is one of several mega projects taking shape in Dubai, which is a member of the oil-rich United Arab Emirates (UAE) federation. Burj Dubai, which was started in 2004, overtook Taiwan's Taipei 101 tower as the world's tallest building when it reached 512 metres (1,533 feet) in April 2007. It became the tallest man-made structure on the planet, when Emaar announced in April that it has surpassed the 629-metre (2,063-foot) KVLY-TV mast in the United States. Its eventual height remains a closely-guarded secret, though there is speculation it will reach a final height of 900 metres (2,953 feet). It had been due for completion in the bustling city state at the end of 2008, but Emaar said in June that "finishing touches" had pushed back the date until September next year. The skyscraper is being built by a consortium involving Arabtec Construction LLC of the UAE, Samsung of South Korea and Besix of Belgium. Many building projects in Dubai, which is going through a construction frenzy, have been facing delays caused by shortage of building materials and skilled labour. Source:Yahoo