U.S. troops in Syria came under attack by a barrage of rockets Monday, prompting the forces to return fire with artillery, the spokesman for Operation Inherent Resolve said in a tweet.
Col. Wayne Marotto, a spokesman for the coalition in Iraq to defeat the Islamic State, said in a tweet that nobody was injured, and the damage is being assessed. He did not say exactly where the attack took place, or who might be responsible.
Marotto said in a message that the U.S. forces, acting in self-defense, returned fire with artillery aimed at the positions from which the rockets were launched.
The rocket attack came about a day after U.S. F-15E Eagle and F-16C Fighting Falcon fighter jets carried out airstrikes on facilities on the Iraq-Syria border. The Pentagon said Iran-backed militias, including Kata'ib Hezbollah and Kata'ib Sayyid al Shuhada, were using the facilities to launch drone attacks on U.S. and coalition personnel and facilities in Iraq.
On Sunday evening, after the airstrikes, Al Jazeera tweeted an Arabic message purportedly from al Shuhada that read, "From now on we will enter into an open war with the American occupation and target its planes in #Iraq."
Marotto said that the initial report indicated the attack took place at about 7:44 p.m. local time, and that multiple rockets were involved.
Pentagon Press Secretary John Kirby said the structures targeted in Iraq and Syria were weapons storage facilities.
The Pentagon also said Iran-backed militias had carried out at least five one-way unmanned aerial vehicle attacks against U.S. and coalition facilities in Iraq since April, as well as ongoing rocket attacks.
The Pentagon also Monday morning released video of three of the airstrikes.