According to Congolese Information Minister Lambert Mende, the fighting began at 4:30 a.m. local time, when Rwandan soldiers crossed over the border in Buhumba in North Kivu and launched an attack that lasted nearly two hours. Before retreating, the Rwandan soldiers kidnapped a Congolese army corporal.
By afternoon, the Congolese soldiers learned their colleague had been killed. The clashes then resumed.
"There is now fighting. There are also talks -- we need really to know what is happening with them," Mende told the BBC.
There was no comment from Rwandan authorities regarding the outbreak of violence.
The neighboring African countries have had a tense relationship since the 1994 Rwandan genocide.