The U.N. refugee agency says renewed fighting in the eastern Democratic Republic of Congo has forced more than 100,000 civilians to flee their homes in the past two months.

The UNHCR said Friday it is “very concerned” about the effects the clashes involving government troops, rebel forces and rival militias are having on civilians.

An agency spokesman said the areas include both North and South Kivu provinces. He said at least 22 people were killed and a number of women raped.

Efforts by the United Nations and the government to integrate the rebels into the army and stabilize the region have largely failed.

Rwandan Hutu rebels, or the Democratic Forces for the Liberation of Rwanda (FDLR), have been accused of committing atrocities in the area.

They rebels arrived in eastern Congo after Rwanda's 1994 genocide, in which Hutu extremists killed some 800,000 people.