Militants attacked a military base in the northern town of Bamba early Monday morning, according to a local government official, who called the assailants "terrorists" and said at least 20 soldiers had died, AFP reported.
Another local official gave a similar account, but suggested the death toll was likely higher than 20, while a leading army official also confirmed an attack had taken place, with losses on both sides.
No group has claimed responsbility for the attack.