Earlier, CNN said citing sources that the missiles launched by the Iranian side hit the part of the Ain al-Asad air base in Iraq where no American troops were stationed.
The U.S. Federal Aviation Administration (FAA) issued emergency restrictions for the Gulf airspace, as Washington-Tehran tensions are escalating.
The FAA said in a statement that it has issued notices to airmen "outlining flight restrictions that prohibit U.S. civil aviation operators from operating in the airspace over Iraq, Iran, and the waters of the Persian Gulf and the Gulf of Oman."
A notice to airmen is a notice filed by an aviation authority to alert aircraft pilots of potential hazards along a flight route or at a location that could affect the safety of the flight.
"The FAA will continue closely monitoring events in the Middle East," said the statement. "We continue coordinating with our national security partners and sharing information with U.S. air carriers and foreign civil aviation authorities."
The announcement came as the Pentagon confirmed on Tuesday that Iran had launched more than a dozen ballistic missiles against U.S. military and coalition forces in Iraq.
"It is clear that these missiles were launched from Iran and targeted at least two Iraqi military bases hosting U.S. military and coalition personnel," the Pentagon said in a statement.
U.S. President Donald Trump "has been briefed and is monitoring the situation closely and consulting with his national security team," according to White House press secretary Stephanie Grisham.
A U.S. airstrike carried out in Iraq last week killed senior Iranian commander Qassem Soleimani, a move that has sparked outrage in Iran which has vowed to retaliate.
The international community is calling for utmost restraint from relevant sides to avoid further escalation of tensions in the Gulf. ■
Strike action being taken by members of Unite, the UK’s leading union, employed by the charity Oxfam has been suspended after talks resulted in an improved pay offer being made.