Kuwaiti air defences mistakenly shot down three U.S. F-15 fighter jets flying in Iran-related operations, the U.S. military said on Monday.

All six aircrew ejected safely, have been recovered, and are in stable condition, it added. The cause of the incident was under investigation.

Several U.S. military aircraft crashed in Kuwait early on Monday, but all crew members survived and were in stable condition, Kuwait’s Ministry of Defence said.

In a separate incident, smoke was seen rising near the U.S. Embassy compound in Kuwait City, with fire trucks and ambulances on the scene, according to Reuters

There were no immediate responses to requests for comment from the U.S. Embassy in Kuwait or the U.S. State Department.

Kuwait intercepted hostile drones earlier on Monday, marking the third consecutive day of Iranian retaliatory strikes on neighbouring Gulf states in response to U.S. and Israeli attacks on Iran.

The Kuwait Defence Ministry statement, carried by the state news agency, said crews from the crashed aircraft were evacuated to a hospital and were in stable condition. It added that the response was carried out in coordination with U.S. forces.

Iran’s state media cited the Islamic Revolutionary Guard Corps as saying Iranian armed forces hit a U.S. plane that crashed in Kuwait.

Online video verified by Reuters, taken in the Al Jahra area of Kuwait, showed a military aircraft falling from the sky and a person parachuting. The Kuwaiti statement did not specify how many aircraft were involved.