DOHA (AFP) - Al-Jazeeras top executive, Wadah Khanfar, resigned Tuesday after eight years as the head of the satellite news channel, the station announced on its website. For some time I have been discussing my desire to step down with the chairman of the board, Khanfar wrote. He has kindly expressed understanding and has accepted my decision. The public probably doubted that Al-Jazeera would fulfil its promise of independent journalism ... We managed to pleasantly surprise them by exceeding all expectations, Khanfar wrote in a two-page farewell to fellow employees. A replacement for Khanfar has so far not been announced.