Which of the following statements about the area Abyei is INCORRECT?

South Sudan is preparing to declare its independence on July ninth. But recent events have raised concerns about the peace process that ended years of civil war with Sudan’s north.
    (26) Last month northern forces seized most of Abyei, an area rich in oil fields in the central part of Sudan. The south voted for separation in January. (27) People in Abyei were supposed to decide that same day whether to join the north or the south. But that never happened because of a disagreement over who could vote.
    (26) The United Nations says tens of thousands of people fled after northern troops and allied militia occupied the area on May 21. They forced out troops from south Sudan. Based on early reports, Abyei’s former chief administrator said about one hundred civilians were killed. There was no independent confirmation of that number.