Egyptian President Hosni Mubarak will not be attending a key Arab League summit, sending a minor Cabinet official instead. Arab foreign ministers in the Qatar capital of Doha have prepared for the summit by calling for unity among members of the 22-nation organization to confront Palestinian discord and international pressure on Sudan. "The challenges are big and the risks are great" warned Qatari Foreign Minister Sheik Hamad bin Jassem Al Thani on Saturday. The main topics to be addressed include the international arrest warrant for Sudan's president and Palestinian divisions. The Egyptian state news agency gave no reason for President Hosni Mubarak's absence from the summit.