CAIRO: A five-nation African summit in Egypt on the conflict in the Darfur region of Sudan has been postponed because some leaders could not attend it, an Egyptian official said on Monday. Egypt had planned to host the meeting in the Red Sea resort of Sharm el-Sheikh on April 20 and had invited the leaders of Chad, Libya, Nigeria and Sudan. "It was agreed that it would be postponed because that time would not be convenient because several leaders have previous arrangements," said the official, who asked not to be identified.