At least eight people have been killed in Yelewta community of Guma Local Government Area of Benue State.
Witnesses said the killings occurred when traders were closing for the day.
Chairman of Guma Local Government Area, Caleb Aba, told newsmen in Makurdi by telephone that the victims were hacked to death.
Aba said it was Yelewta market day and that the people had hardly closed for the day when the gun-wielding invaders pounced on them, killing eight on the spot.
The chairman added that the injured had been taken to the hospital for treatment.
Police Public Relations Officer of the state, DSP Catherine Anene, confirmed that six people were killed by gunmen.