Insurgents shot and killed an adviser to one of Iraq's top Sunni Arab officials on Tuesday as he drove to work in Baghdad, police said. The shooting of Ayed Abdul Ghani occurred in new Baghdad, an eastern section of the capital, at about 7:45 a.m., said police Maj. Falah Al-Mohammedawi. The insurgents either drove up beside Ghani's vehicle and opened fire or first stopped the victim's car by blocking it, Al-Mohammedawi said.Ghani served as an adviser to Osama al-Najafi, Iraq's industry minister and one of the country's top Sunni Arabs. Before Iraq's constitutional referendum on Saturday, al-Najafi had predicted that voters would reject the document if given the chance to vote freely because it favors Kurds and majority Shiites over the Sunni minority. Vote counting was still under way Tuesday, and the outcome of the referendum was not expected to be announced by Iraq's election commission for several days.