Two armed drones targeted Iraq’s Ain al-Asad airbase, which hosts US forces in western Iraq, a security source and a government source told Reuters on Tuesday.

The attack in the early hours of Tuesday, did not cause casualties or damage, the sources said.

There has been an increase in attacks on US forces since the conflict in Israel broke out on Oct. 7 and Iraqi armed groups acting as Iran’s proxies threatened to target US interests with missiles and drones if Washington intervened to support Israel against Hamas in Gaza.

A group called the "Islamic resistance in Iraq" has endorsed Tuesday's attack, and also took responsibility for previous strikes. Iran's Revolutionary Guard media has been amplifying the group's statements.

President Joe Biden and other US officials have warned Iran and its allies to not get involved in the Israel-Hamas war.

So far, Iran’s proxy groups have launched more than 20 attacks against US bases in Iraq and Syria. On Friday, the US responded by bombing two warehouses said to belong to Iran’s Revolutionary Guard in Syria, however that has not deterred the militant groups.

On Monday, four Katyusha rockets were fired at Iraq's Ain al-Asad air base, but it was not clear if the attacks caused damage or casualties.

The Iranian regime welcomed the October 7 terror attack by Hamas, organizing street celebration hours after the news broke. Iranian officials have since expressed full support for Hamas as more evidence has emerged of Tehran’s military and financial support for the militant Palestinian group.