Supporters of Niger's ruling junta demonstrate in Niamey, Niger
Videos filmed by residents of the area showed streaks of light in the sky with the sound of loud explosions, while other images showed flames several metres high and charred cars.
The capital's Diori Hamani International Airport houses an air force base and is located about 10 kilometres (six miles) from the presidential palace.
Niger, a country hit regularly by jihadist attacks, has been led for more than two years by Abdourahamane Tiani, the head of a junta that overthrew the country's elected civilian president in 2023.
The shooting began shortly after midnight, according to residents of a neighbourhood near the airport.
Calm returned two hours later, they told AFP.
It was not immediately clear what had caused the gunfire and whether there were any casualties.
The sound of sirens from fire trucks heading towards the airport could also be heard in the early hours of the morning, residents said.
An online activist who supports military rule, Ibrahim Bana, posted a video on Facebook in which he called on people to take to the streets of the capital to "defend the country."
-Jihadist violence-
The country's largest international airport is also the headquarters of a joint force created by Niger, Burkina Faso and Mali to combat jihadist groups waging deadly violence in the region.
Since taking over the country, Niger's military leadership has forced out French and US forces who had been helping to combat the jihadists.
Niger and its neighbours, also led by military juntas, have teamed up to create their own confederation, the Alliance of Sahel States (AES), and have announced the creation of a 5,000-strong force for joint military operations.
According to ACLED, an NGO that tracks conflict casualties globally, jihadist violence killed nearly 2,000 people in 2025 in Niger.
A huge Uranium shipment with an unknown buyer, which left the country's north in late November, has also been stuck at the airport for weeks.