The investigation by Iraq's election commission has raised the possibility that the results of the referendum could be called into question. As many as 99 percent of the voters reportedly approved Iraq's draft constitution in some of the provinces being investigated.
As CBS News correspondent Allen Pizzey reports, some initial results showed almost no turnout in some Sunni areas and as high as 66 percent in others,
Meanwhile, insurgents resumed attacks that had fallen sharply during Saturday's vote at heavily protected polling stations across the country.
Militants killed five Iraqis on Tuesday, including an adviser to one of the country's top Sunni Arab officials who was shot while driving to work in Baghdad, police said. The handcuffed and mutilated bodies of six Iraqis who had been kidnapped and killed in captivity also were found in three locations of the capital, police said.
In fighting in western Iraq, two U.S. Marines and four militants were killed near the town of Rutba, not far from the Jordanian border, on Monday, the military said. At least 1,978 members of the U.S. military have died since the beginning of the Iraq war in March 2003, according to an Associated Press count.
In other developments:
Adil al-Lami, head of the Independent Electoral Commission of Iraq, told The Associated Press on Tuesday that ballot boxes were arriving from the provinces and that employees had resumed counting.
"If we suspect that the numbers are higher or lower than we expected, we have to double-check them, and this audit means it might be several more days before we announce the final outcome," he said. "We are not concerned whether the outcome is `yes' or `no.' We are only interested in making the process technically a success."
He said the commission is "a neutral body" acting "as a referee."
The investigation by the commission in Iraq's landmark referendum has raised questions about irregularities in the balloting.
Word of the review came Monday as Sunni Arab leaders repeated accusations of fraud after initial reports from the provinces suggested the constitution had passed. Among the Sunni allegations are that police took ballot boxes from heavily "no" districts, and that some "yes" areas had more votes than registered voters.