The Democratic Republic of Congo has accused Rwandan soldiers of crossing into its territory.
The Congolese army issued a statement describing the alleged incursion into North Kivu province as an intolerable provocation.
It said the Rwandan soldiers had been forced back across the border.
There has been no word from Rwanda.
It has previously denied accusations by the DR Congo government that it backs a rebel group known as M23, which has carried out numerous attacks in eastern DR Congo.