A major dam and hydroelectric power plant in southern Ukraine were severely damaged on Tuesday, unleashing flooding near the front lines. Ukraine and Russia accused each other of attacking the site. As water gushed from the rupture of the Kakhovka dam on the Dnieper River, which separates Ukrainian and Russian forces, officials on both sides ordered residents to evacuate. The Biden administration is closely monitoring the effects of the breach but has not made a determination about who or what caused it, a White House spokesman said.