The evacuation order came as the UN prepares to begin on Saturday a campaign to vaccinate an estimated 640,000 children in Gaza, where the World Health Organization (WHO) said a 10-month-old baby had been paralysed by the type 2 polio virus, the first such case in the territory in 25 years. "We're unable to deliver today with the conditions that we're in," said the senior UN official, speaking on condition of anonymity.
