At least 21 people have been killed in a series of five bizarre crashes involving Sudanese air force craft and helicopters during the 24-day period from September 9 to October 3, according to the official Sudanese army’s Twitter feed. On October 3, the Sudanese army Twitter feed reported that “Sudan Air Force AN 30 & AN 32, both crashed while landing at Khartoum airport ,the airport is closed...