Thousands of people in the south east of Democratic Republic of Congo are fleeing fighting between rebels and the army, a humanitarian group has said.
The cycle of conflict has seen thousands displace in DR Congo
Medecins Sans Frontieres told the BBC that the town of Dubie in Katanga has doubled its population to 20,000.
This follows an army operation to end Mai Mai militia raids in Katanga ahead of elections due next year.
Those pouring into the town have already been displaced by the long-running conflict in the area.
"The condition of the internally displaced people is not good at all; a lot of them have been walking for days and had been living in the bush for almost four years before that," MSF's Goedele Van Bavl told the BBC's Network Africa programme.
She said the town, 400km north of the city of Lubumbashi, was finding it difficult to cope with the huge influx of people, many of whom were sleeping in the open and finding little food.
Some parts of Katanga are being called the "Triangle of Death" after repeated raids by Mai Mai fighters who kill, loot and rape.
Elections are due next year under a 2002 deal to end a five-year civil war.
Some 15,000 UN troops are in DR Congo to help restore stability and organise elections next year.