The attack happened on 2 November on the notorious Bama-Banki road when the wedding party, including friends and relatives of the groom, was making its way back to the state capital Maiduguri after the ceremony in Michika, in nearby Adamawa State.
The driver, who did not wish to be named, said many of the victims appeared to have suffered gunshot wounds.
“It was a gory scene and all the victims were brutally murdered by the attackers. My passengers and I were visibly shocked when we met the dead bodies lying by the highway,” he said.
Army and police officials in the area were not immediately available for comment.
But a security source who described the incident as “brutal and callous” said the bodies had been transferred to a hospital in Maiduguri.
Violent attacks are not uncommon in northeastern Nigeria, where the army has launched an offensive to end an insurgency by Boko Haram Islamists.