U.S.-led forces launched artillery strikes in Syria after “indirect fire” from suspected Iranian-backed militias hit a U.S.-coalition base in northeast Syria.

A statement Tuesday from the Combined Joint Task Force – Operation Inherent Resolve (CJTF-OIR) indicated coalition forces were targeted “by eight rounds of indirect fire at Green Village, a Syrian Democratic Forces base with a small Coalition advisory presence.”

The statement said the indirect fire attack did not cause any casualties, but several rounds caused damage to the coalition base. In response, coalition forces “responded swiftly and fired six rounds of artillery towards the point of origin of the attack,” the CJTF-OIR statement read.

“The Iran-supported malign actors fired on the Coalition and SDF from within civilian infrastructure with no regard for civilian safety,” the statement pointed out. “These inaccurate and indiscriminate indirect fire attacks pose a serious threat to innocent civilians because of their lack of discrimination,” said CJTF-OIR commander Maj. Gen. John W. Brennan, Jr.

The artillery strikes come after the U.S. shot down two armed drones near Baghdad International Airport Monday, according to news reports. An official with CJTF-OIR told the Associated Press that its air-defense system engaged two so-called “suicide drones” near the airport Monday.

This was a dangerous attack on a civilian airport,” a coalition official said, according to the Associated Press.

No one took responsibility for the attack the Associated Press reported, but the two drones shot down reportedly had the words “Soleimani’s revenge” painted on them.

Both incidents come the week of the 1-year anniversary since a U.S. drone strike in 2020 killed Gen. Qassim Soleimani, who was the head of Iran’s elite Quds Force, which is Iran’s main overseas operations arm. The 2020 strike also killed Abu Mahdi al-Muhandis, the deputy commander of Iran-backed militias in Iraq known as the Popular Mobilization Forces, according to The Associated Press.

Officials have not indicated whether they believe these recent attacks are related to last year’s drone strike that killed Soleimani, according to CNN.

"The Coalition reserves the right to defend itself and partner forces against any threat, and will continue to do everything within its power to protect those forces," Brennan also said, according to the CJTF-OIR statement. "Our Coalition continues to see threats against our forces in Iraq and Syria by militia groups that are backed by Iran. These attacks are a dangerous distraction from our Coalition's shared mission to advise, assist, and enable partner forces to maintain the enduring defeat of Daesh."