NEW : U.N. says rebel troops to adhere to cease-fire . Conditions in the region were `` continuing to deteriorate rapidly , '' the medical charity Doctors Without Borders said in a statement posted on its Web site . thousands flee refugee camp in matter of hours . Doctors Without Borders says its peacekeepers still in charge of Congo . Goma says French forces join fight with minority Tutsi rebels .
NEW : U.N. says rebel troops to adhere to cease-fire . thousands flee refugee camp in matter of hours . Doctors Without Borders says its peacekeepers still in charge of Congo . Goma says French forces join fight with minority Tutsi rebels .