The Democratic Republic of the Congo (DRC) claims that 500 disguised members of the Rwandan Special Forces have intruded into the DRC.
Congo accuses Rwanda of sending disguised troops across border, the latest accusation in an escalating dispute between the neighbours.
Rwanda's army spokesman said it was a fake story. A government spokeswoman said Rwanda would not respond to baseless accusations.
In a statement, the Congolese military said 500 Rwandan special forces, wearing a green-black uniform that is different from their regular uniform, had been deployed in the Tshanzu area in North Kivu province, which borders Rwanda.
Rwanda denies this and in turn accuses Congo's army of firing into its own territory and of fighting alongside the FDLR, an armed group run by ethnic Hutus who fled Rwanda after taking part in the 1994 genocide.
The Congolese army's statement also said that M23 rebels, supported by Rwanda, had attacked a United Nations peacekeeping force in the Rutshuru area, also in North Kivu, and had injured three Tanzanian peacekeepers.
The United Nations mission in Congo did not immediately respond to a request for comment.
The latest fighting in eastern Congo has forced tens of thousands to flee their homes in a region that has had little respite from war since Rwanda and Uganda invaded in 1996, citing threats from local militia groups.
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