The rebel radio said they had been slain by rebels at Kabgaye, south of the capital, Kigali.
The rebel radio, Venceremos, asserted that the attack had been a great success for the guerrillas.
Few Angolans could guess with confidence today whether his 11th-hour withdrawal from the peace accord was a temporary tantrum or whether, as the rebel radio proclaimed, "all is lost."
Sudanese rebels have released three American aid workers and a British nurse, seven weeks after they were abducted in the southern Sudan, the rebel radio reported.
Nicaraguan rebel radio on Monday blamed the Popular Liberation Forces for the killing.
"And we have already warned them several times not to enter into these areas without prior permission," the rebel radio said.
The rebel radio has denied that the guerrillas carried out the shootings.
The rebel radio, monitored in Nairobi, has taken responsibility for killing drivers in the convoy, which was traveling with a Government military escort.
The capture could not be independently verified, although previous such claims over the rebel radio have often proved accurate.
Listening to the clandestine rebel radio was an activity needing elaborate precautions.