washington — The White House described Sudan’s civil war as a genocide Wednesday, a day after Washington placed sanctions on the nation’s rebel leader for his forces’ “horrific, systematic atrocities” in a conflict that has gripped the nation for more than two years, killing tens of thousands of people and driving millions from their homes. “This is the second genocide in a generation in Sudan,” said John Kirby, spokesperson for the White House National Security Council. He was referring to the brutal Darfur conflict, in which Sudanese Arab Janjaweed militias used scorched-earth tactics on the Fur, Masalit and Zaghawa people