The number of internally displaced people in the Central African Republic (CAR) has more than doubled to 935,000 since December, the UN says.
Around 500,000 have fled their homes in the capital Bangui alone – almost half the city’s population. Some 60% of those displaced are children.
The UN also warned the escalating violence was hampering efforts to reach “those in need of urgent assistance”.
The conflict has pitted Christian and Muslim militias against each other.
The CAR is ruled by Muslim ex-rebel leader Michel Djotodia who seized power last March, forcing then-President Francois Bozize, who came from the majority Christian population, to flee into exile.
The African Union has sent nearly 4,000 troops while France, the former colonial power, has also deployed 1,600 soldiers there.
Many foreign governments have begun to evacuate their citizens.