The ruling party in Iraq's semi-autonomous north has accused a faction affiliated with Hashd al-Shaabi, an umbrella group of predominantly Shia militias, of being behind recent missile attacks on Erbil, the region's capital.
In a statement on Tuesday, Kurdistan Democratic Party spokesman Mahmoud Muhammad warned of "grave consequences" if attacks in the Kurdish Regional Government (KRG) area continue.
Rockets on Monday struck Erbil airport-which has a military base for the US-led anti-Daesh/ISIS coalition-and its surroundings, killing a civilian contractor and injuring eight others, including a US soldier.
The armed Hashd al-Shaabi group of nearly 40 militias is said to have links with Iran.
In the nation's capital Baghdad, Iraqi Prime Minister Mustafa Al-Kadhimi has formed a joint committee for further investigation.
The Guardian of Blood Brigades militia claimed responsibility for the rocket assault targeting "American occupation."
The Shia group has claimed responsibility for attacks on anti-Daesh forces in the past as well, and is said to be a part of the Hezbollah Brigades, which is backed by Iran.
