NEW : `` It 's dozens and dozens , scores of casualties , '' the head of U.S. Embassy says . NEW : Hundreds civilians have fled to U.S. Embassy bases in the city , he says . United Nations says the U.N. Security Council suspending normal operations until further notice . Sporadic gunfire still rattling Juba , diplomats say .
NEW : `` It 's dozens and dozens , scores of casualties , '' the head of the U.N. Security Council says . NEW : About 15,000 to 20,000 civilians have fled to United Nations bases in the city , he says . State Department says U.S. Embassy suspending normal operations until further notice . Sporadic gunfire still rattling Juba , diplomats say .