A lone bomber in tribal dress infiltrates what was to have been a reconciliation meeting between Shiite and Sunni tribesmen. Five Guard commanders are killed. At least 28 people also are wounded. In a brazen attack on Iran's military elite, a suicide bomber today killed five Islamic Revolutionary Guard Corps commanders and 26 others at a gathering of tribal leaders in a southeastern province near the Pakistan border that's known for drug running and religious extremism, according to the official Iranian news agency.