NEW : 72 of the new peacekeepers have arrived in Juba , the U.N. says . East African Group tell South Sudan government , rebels to stop fighting or else . The warning came the same day the United Nations said the first of 5,500 additional peacekeepers had arrived in the country . Group says it will take unspecified action if fighting does n't stop within four days . South Sudan 's government says it 's ready to negotiate a cease - fire .
NEW : 72 of the new peacekeepers have arrived in Juba , the U.N. says . East African Group tell South Sudan government , rebels to stop fighting or else . Group says it will take unspecified action if fighting does n't stop within four days . South Sudan 's government says it 's ready to negotiate a cease - fire .