The militia, named Islamic Resistance in Iraq, claimed in an online statement on Tuesday that its fighters fired rockets on the al-Shaddadi military base and hit their targets, without giving further details, Xinhua news agency reported.

The attack by the Iraqi armed group is part of a series of retaliatory measures against the US forces amid the ongoing conflict in the Gaza Strip, the group's statement added.

Meanwhile, the Syrian Observatory for Human Rights, a UK-based war monitor, confirmed that explosions were heard in the al-Shaddadi base. There are no reports of casualties so far.

The incident marked the 61st recorded attack on the US bases in Syria since October 19, the war monitor added.

Earlier in the day, the White House said that US President Joe Biden ordered the military to launch airstrikes against three locations utilized by Kataib Hezbollah and affiliated groups in Iraq. The order came after a drone attack on Monday on a US base near Erbil Airport in northern Iraq wounded three US service members, one critically.

Later in the day, the Iraqi government condemned the US airstrikes on Iraqi security sites, which killed a security member and injured 18 people, including civilians, according to a statement by the media office of Prime Minister Mohammed Shia' al-Sudani.