A U.S. base in northern Iraq was subjected to an intense rocket attack late Monday. One foreign contractor was killed and at least eight people were wounded, including American and Iraqi security personnel and an American servicemember. This is the first attack on a U.S. base in months.

U.S.-led coalition spokesman, Col. Wayne Marotto, said in a statement posted on social media that the contractor killed was a foreigner but didn’t specify his nationality as the investigation is continuing. 

“CJTF-OIR confirms approx. 14 107 mm rockets launched with 3 impacting within EAB, Feb 15 at 2130 hours (Iraqi time). One civilian contractor was killed (Not U.S.), and 9 injured (8 CIV contractors/ 1 US MIL) – 4 US/ 1 US MIL concussion protocol,” Marotto posted on Twitter.

The rockets were launched late on Monday from an area south of Erbil near the border with Kirkuk province. At least three rockets hit the area of the base near the airport.

A post on social media allegedly showed two rockets Iranian-made 107mm rockets that didn’t detonate. 

The attack on Erbil was claimed by a little-known Shia group calling itself Awliyaa al-Dam, or Guardians of Blood.

There have been several new groups popping up in Iraq. American and Iraqi security officials believe that they are just front groups for prominent pro-Iran factions including Kataib Hezbollah and Asaib Ahl al-Haq.

According to a post from the SITE Intelligence Group, an NGO that tracks and analyzes online activities of extremist and designated terrorist groups, Awliyaa al-Dam, the terrorist group that perpetrated the attack, said, “The American occupation will not be safe from our strikes in any inch of the homeland, even in Kurdistan, where we promise we will carry out other qualitative operations.”