The United Nations on Wednesday said nearly three months of war in Sudan have uprooted more than three million people, and called for the warring sides to face "accountability".Britain said it was taking action. It announced sanctions on businesses it said were associated with Sudanese military groups on both sides of the conflict.Fighting has raged in the northeast African country since mid-April, when army chief Abdel Fattah al-Burhan and his former deputy Mohamed Hamdan Daglo, who commands the paramilitary Rapid Support Forces (RSF), turned on each other.