Representatives of the rebel movements in Sudan's western Darfur region have agreed to allow some 500,000 children cut off from regular health services to be vaccinated against such potentially killer diseases as measles and polio, the United Nations announced. Agreement was reached with the Sudan Liberation Army (SLA) and the Justice and Equality Movement (JEM) after a UN team met their representatives last Friday in Asmara, Eritrea, according to the UN in Khartoum.