An explosion sounded Sunday near Erbil airport, which hosts US-led coalition troops in Iraq's autonomous Kurdistan region, AFP journalists said.
Iraqi Kurdish counterterrorism forces said the explosions resulted from "military training and security activities... and cause no danger".
Local Kurdish media reported that the US-led coalition had detonated ordnance in the area.
An AFP journalist reported seeing grey smoke rising from near the airport.
The US-led coalition troops are scheduled to complete their withdrawal from Iraq by September 30, having concluded their mission against the Islamic State group.
They had already withdrawn from other bases in Iraq in January and had begun pulling out from Kurdistan.
They are now only deployed at Erbil airport.
The presence of the US-led troops has been a persistent point of contention between Iraqi authorities and Tehran-backed armed factions, which have targeted coalition forces for years.
Coalition forces have downed many explosive-laden drones over Erbil and its airport over the years, and such attacks have intensified during the Middle East war that began in February.
During the war, Iran has announced several times striking US bases in Iraq's Kurdistan.