The U.S. military launched airstrikes early Friday on two locations in eastern Syria linked to Iran’s Revolutionary Guard Corps, the Pentagon said, in retaliation for a slew of drone and missile attacks against U.S. bases and personnel in the region that began early last week.

The U.S. strikes reflect the Biden administration’s determination to maintain a delicate balance. 

The U.S. wants to hit Iranian-backed groups suspected of targeting the U.S. as strongly as possible to deter future aggression, possibly fueled by Israel’s war against Hamas, while also working to avoid inflaming the region and provoking a wider conflict.

Information about the specific targets and other details were not yet provided.

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According to the Pentagon, there have been at least 12 attacks on U.S. bases and personnel in Iraq and four in Syria since October 17. 

Air Force Brig. Gen. Pat Ryder said 21 U.S. personnel were injured in two of those assaults that used drones to target al-Asad Airbase in Iraq and al-Tanf Garrison in Syria.

America strikes back: US warplanes conduct airstrikes against Iranian proxy forces in Syria in retaliation for attacks against US troops in Middle East