Sustained heavy gunfire and loud explosions have been heard in Niger near the international airport outside the capital, Niamey.
Multiple eyewitness accounts and videos showed air defence systems apparently engaging unidentified projectiles in the early hours of Thursday.
The situation later calmed down, reports say, with an official reportedly saying the situation was now under control, without elaborating.
It is not clear what caused the blasts, or if there were any casualties. There has been no official statement from the military government.
