Aid agency, Médecins Sans Frontières, says far more humanitarian assistance is urgently needed in the east of the Democratic Republic of Congo.
MSF says about a million people have been forced to flee their homes in North Kivu province over the last year as a result of violent clashes linked to the M23 rebel group.
The medical charity says most of the displaced are living in appalling conditions and its teams are completely overwhelmed with increasing cases of measles and cholera.
Several East African countries have deployed troops to eastern Congo in an effort to get the M23 rebels to withdraw.
DR Congo has accused the neighbouring Rwanda of supporting the rebel group, a claim Kigali denies.