Distribution of shelter materials and other relief items is more challenging, Mr. Baloch said, given the increasing numbers of families in need.
"In the previous week, the number of IDPs arriving at the airport had almost doubled, and now there were some 100,000 people there," he said.
More than half of Bangui's total population - some 512,672 people - are currently sheltering in 67 sites in Bangui or living with host families, according to UNHCR figures. Sixty per cent of those displaced are children.
Continued clashes in Bossangoa, 300 km north of Bangui, had also led to an increase in displaced families, particularly at two nearby sites known as Archbishop and École Liberté.
Also in CAR, the UN World Health Organization (WHO) is today starting a vaccination campaign against measles in parts of the country with support from the UN Children's Fund (UNICEF) and other partners.
Over the next three to five days, some 50,000 doses of the vaccine will be given to children between six months and 15 years of age seeing refuge at the Bangui airport. WHO has confirmed three cases of the viral infection there.