ADDIS ABABA, Ethiopia -- Ethiopia's longtime ruler and most powerful figure, Prime Minister Meles Zenawi, is not attending an African Union summit that opened Sunday in Ethiopia, which further fueled speculation that he might be seriously ill.About three dozen African heads of state and government gathered in Addis Ababa on Sunday, but Meles did not attend the meeting – a first since he assumed office in 1991.Read More... More on Video