Explosions and gunfire have been heard coming from the airport in Niger's capital, Niamey. This was reported by Qazaqyia.kz citing BBC News.
Residents said the gunfire started at 06:00 (05:00 local time) and lasted for two hours. A witness told AFP news agency that the gunfire came from the entrance to the airport.
"I heard the first gunshots at 06:00 while I was at the mosque. But the current situation is under control," one person said.
Niger has been fighting a militant Islamist insurgency for a decade. In January, suspected jihadists launched an attack on the same airport. Like its neighbours, Burkina Faso and Mali, Niger is run by a military junta that came to power in part because of the failure to deal with the violence.
Residents have told the BBC that Thursday's attack was repelled by the army, which is now hunting down the fleeing assailants who reportedly abandoned their weapons.
The authorities have not yet commented and no group has said it was responsible. But an affiliate to the Islamic State group said it had carried out January's assault.
This breaking news story is being updated and more details will be published shortly.