It appears that the al-Hadba Gathering, a Sunni Arab party, did well enough in local elections in Nineveh province to take control of the provincial council from the Kurds, which means that they have control of it and its its capital, Mosul.
The party, and its leader Atheel al-Nujaifi, took a fairly explicitly anti-Kurdish line during elections, and needless to say, the Kurds, who had previously held 31 of the council’s 41 seats, are not amused and are suggesting some level of electoral fraud.
While not a part of the Kurdish autonomous region, they Kurds have maintained that Mosul should be incorporated into this area.