US Defence Secretary Lloyd Austin has vowed the US will take "all necessary actions" to defend its troops after a deadly drone attack in Jordan by Iran-backed militants, even as President Joe Biden's administration stressed it was not seeking a war with Iran.
The attack on Sunday killed three US soldiers and wounded more than 40 troops. It was the first deadly strike against US troops since the Israel-Hamas war erupted in October and marks a major escalation in tensions that have engulfed the Middle East.
"Let me start with my outrage and sorrow (for) the deaths of three brave US troops in Jordan and for the other troops who were wounded," Austin said at the Pentagon.
"The president and I will not tolerate attacks on US forces and we will take all necessary actions to defend the US and our troops," Austin added at the start of meeting with NATO Secretary General Jens Stoltenberg at the Pentagon.
"As the president said yesterday, we will respond and that response could be multi-levelled, come in stages and be sustained over time,” US Secretary of State Antony Blinken said.
But officials across the Biden administration said they did not want the situation to escalate. The Pentagon suggested Iran didn't want a war either.
"We certainly don't seek a war and frankly we don't see Iran wanting to seek a war with the United States," Pentagon spokeswoman Sabrina Singh told reporters. She added that the Pentagon believed Iran did not want a war either.
"We are not seeking a conflict with the regime in the military way," White House national security spokesman John Kirby said, adding that Biden was working his way through response options.
The United States is trying to determine exactly why the nearly 350 troops at the base in Jordan, known as Tower 22, were unable to stop the drone.
Two officials said a US drone was approaching the base around the same time the attack drone was incoming. One of the officials said the attack drone was also flying low, factors that may have contributed to it being missed by base defences.
The US military released the names of the victims, the youngest of which was a 23-year-old Army Reserve specialist, Breonna Alexsondria Moffett.
US troops have been attacked more than 160 times in Iraq, Syria and Jordan since October 7 and warships been attacked in the Red Sea as well. Houthi fighters in Yemen have been firing drones and missiles at them on the Red Sea.
The attacks are piling political pressure on Biden to deal a blow directly against Iran, a step he has been reluctant to take out of fear of igniting a broader war.
Biden met with Austin and other members of his national security team in the White House Situation Room on Monday morning to discuss the latest developments regarding the attack, the White House said.
The president's options could include targeting Iranian forces outside or inside Iran and opting for a more cautious retaliatory attack solely against the Iran-backed militants responsible, experts say.
"Iran continues to destabilise the region, this includes backing terrorists who attack our ships in the Red Sea," Stoltenberg said.
The attack, and any potential US response, is likely to fan fears of wider conflict in the Middle East, where war broke out in Gaza after Palestinian Islamist group Hamas' raid on Israel on October 7, which killed 1200 people.
Israel's subsequent assault on Gaza has killed more than 26,000 Palestinians, according to the local health ministry.
