Architects Norman Foster and Zaha Hadid are among those chosen to redevelop the holy city of Mecca, one of the biggest projects in the world.
According to British media reports, the top-secret plans are being backed by Abdullah ben Abdulaziz of Saudi Arabia who is looking to some of the world's best architects to establish new designs for the 356,800m² mosque complex.
The project could be completed in different phases with Foster + Partners to look at a range of alternatives for the northern expansion of the Haram mosque, in the complex.
It is believed engineers including Faber Maunsell are also in the running for the project.
The pilgrimage site is visited by millions of Muslims every year.
By staff writer.