Four Katyusha rockets on Monday fired at Iraq's Ain al-Asad air base which hosts US and other international forces in western Iraq, security sources said.

It was not clear yet if the attack caused any casualties or damage and two army officials said the rockets might have landed away from the base, according to Reuters.

Sunday night, unidentified aircraft conducted multiple air strikes on a 10-truck convoy stationed on the Syrian side of the Iraq-Syria border. It is not clear whether the attack was a second retaliatory US strike, after US warplanes hit Iranian Revolutionary Guard arms depots on Friday.

Rockets were fired from a desert area around 25km (15 miles) north of the base and Iraqi security forces launched a search for the attackers, two security 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 aligned with Iran threatened to target US interests with missiles and drones if Washington intervened to support Israel against Hamas in Gaza. Iranian proxies have launched nearly twenty rocket and drone attacks at US bases in Iraq and Syria in the past 10 days.

The United States has warned the Iranian regime and its proxy forces across the region not to interfere in the Gaza war and threatened to retaliate if American forces come under fire.