A mission sent by the World Heritage Centre in November 1998 to Sana’a had reported that there were plans for the extension of the Great Mosque of Sana’a and for the construction of a large fly-over between the two parts of the city.  The twenty-second extraordinary session of the Bureau (November 1998) recommended that work on these two projects should be halted pending a global study on the development of Sana’a.  This was communication to the authorities in January 1999.  The Secretariat informed the Bureau that the extension of the Grand Mosque has been abandoned.  Furthermore, the Observer of Yemen provided additional information on the flyover, the length of which had been reduced.  Consequently, the Bureau requested the Yemeni authorities to collaborate with the Secretariat in studying the holistic management of the site before works began.  The Bureau also requested the authorities to receive at their earliest convenience a mission of specialists to study together alternative solutions for the development projects.  This mission should report to the forthcoming session of the World Heritage Committee.