The United Nations mission in Rwanda says government troops are gearing up to attack Rwandan Hutu rebels based in eastern Democratic Republic of Congo.
A spokeswoman, Patricia Tome, says the head of the mission, William Swing, received a telephone call from a Rwandan official, advising him of the action. She declined to identify the official.
Reuters news agency quotes an adviser to Rwanda's President Paul Kagame, Richard Sezibera, who confirmed the possibility of clashes. He said Hutu rebels in Congo are massing near the border with Rwanda, adding that the government will take any means necessary to defend Rwandan territory.
In recent years, Rwandan troops have entered Congo on two occasions to attack Hutu extremists who fled across the border after participating in the massacre of hundreds of thousands of minority ethnic Tutsis during Rwanda's 1994 genocide.
Some information for this report provided by AP and Reuters.