Two gunmen killed a prominent Iraqi exile and wounded his nephew as they sat in the crowded lobby of the Khartoum Hilton Hotel, according to Sudan's Interior Ministry. The slain man was identified as Mahdi Hakim, a brother and chief aide of Mohammed Baqer Hakim, a leading Shia Muslim foe of President Saddam Hussein of Iraq. The two men were in Khartoum for the second national congress of the National Islamic Front. Witnesses said the getaway car bore diplomatic license plates. In Tehran, Iranian news media quoted Iraqi dissident spokesmen as saying the plates were assigned to the Iraqi Embassy in Khartoum.