In a much anticipated counterattack, the Iranian regime fired upon U.S. forces in the Middle East late Monday. No casualties were reported, and a U.S official said an initial damage assessment concluded that Iran’s missiles did not hit their intended targets.

The Islamic Revolutionary Guard Corps (IRGC) claimed credit for a “powerful and destructive missile strike” against the Al Udeid military base in Qatar. Iran “will not leave any attack on its territorial integrity, sovereignty, and national security unanswered under any circumstances,” they added.

Qatari air defense systems successfully intercepted the missiles, Qatar’s Defense Ministry said, “We express the State of Qatar’s strong condemnation of the attack on Al Udeid Air Base by the Iranian Revolutionary Guard Corps, and consider it a flagrant violation of the State of Qatar’s sovereignty and airspace, as well as of international law and the United Nations Charter,” a Qatari Foreign Ministry spokesman responded. “We affirm that the State of Qatar reserves the right to respond directly in a manner proportional to the nature and scale of this blatant aggression and in accordance with international law.”

Al Udeid is the largest of eight U.S. military bases in the Persian Gulf states. The U.S. operates five military bases in Kuwait, one in Bahrain, and one in the U.A.E., and the U.S. military maintains a presence at roughly a dozen other bases in the region.

The attack has disrupted air travel throughout the region. After Iran’s attack, two dozen commercial aircraft headed for Doha or Dubai turned around or diverted. In anticipation of any further military action, Bahrain and the U.A.E. have closed their airspace, and numerous airlines have suspended their service to the Persian Gulf region.

The secretariat for Iran’s Supreme National Security Council noted that Iran fired a number of missiles equal to the bombs dropped by American aircraft in a Saturday night strike on its nuclear weapons facilities.

Iran also gave Qatar advance notice of the attack, CNN reported, leading Qatar to close its airspace ahead of the attacks. Their anonymous source said the move was intended to minimize casualties and provide an off-ramp to further retaliatory strikes. CNN also reports that the U.S. military had moved non-sheltered planes away from the Al Udeid Air Base last week.

The move echoes Iran’s response to America’s killing of IRGC Gen. Qassem Soleimani in early 2020. On January 8, 2020, Iran fired missiles at two Iraqi air bases where U.S. forces were stationed. The face-saving strikes allowed Iran to claim it had exacted its promised “revenge,” but no U.S. casualties resulted from the attacks. “We knew they’d retaliate. They had a similar response after Soleimani,” an anonymous White House official told CNN.

The missile attacks reportedly occurred while President Donald Trump was meeting with his national security team at the White House. After the Saturday airstrikes, Trump warned that “any retaliation by Iran against the United States of America will be met with force far greater than what was witnessed tonight.”