In a statement via their official Twitter account, the Popular Mobilization Forces said, "U.S. planes bombed sites belonging to the Popular Mobilization Forces in western Al-Anbar."
The Pentagon has since confirmed the strikes as well, claiming that the "U.S. airstrikes targeted Iran-backed proxy force Kata'eb Hezbollah's facilities in Iraq and Syria after an American defense contractor was killed in a rocket attack on Friday."
Local reporters in the Al-Anbar province claimed that the U.S. attack resulted in several casualties for the Kata'eb Hezbollah forces, but no further details were released.
On Friday, several rockets targeted the Iraqi Army's K-1 Base in the Kirkuk province; this base houses several U.S. military personnel in northern Iraq.
No group claimed responsibility for the attack; however, Washington has accused the Iranian-backed forces in Iraq for the rocket asault.
Iran has yet to issue a statement regarding this latest attack by the U.S. military.