Two armed drones were shot down on Monday as they neared an Iraqi military base hosting US troops near Baghdad's international airport, according to Iraqi security sources, who added that no one was harmed in the incident.

The attack occurred as Iran and its Iraqi allies commemorated the second anniversary of the assassination of top Iranian general Qassem Soleimani. Soleimani was killed in a drone strike near Baghdad's airport, which was ordered by then-US President Donald Trump.

In response to the attack, an official with the US-led international military coalition stated that the base's defence system had been activated "two fixed-wing suicide drones.  They were shot down without incident."

"This was a dangerous strike on a civilian airport," a coalition official said in a brief statement.

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The attackers made no quick claim of responsibility. Armed organisations that some Iraqi officials say are backed by Iran have claimed responsibility for similar events in the past.

Footage provided by a coalition official shows the debris of two fixed-wing drones demolished in the attack, with writing clearly visible on one drone's wing reading "Soleimani's revenge," according to the official.

On January 3, 2020, Soleimani, the chief of an elite overseas unit of Iran's Revolutionary Guards, was killed in a US drone strike on his convoy at Baghdad airport, along with Iraqi militia leader Abu Mahdi al-Muhandis.

On the anniversary of Soleimani's murder, hundreds of supporters of Iran-backed militia groups gathered at Baghdad airport on Sunday to yell anti-American chants.