Iran has launched a series of missiles at American military bases in the Middle East in retaliation for Sunday morning's US bombing raids.
Six missiles were sent towards the US-run Coalition Air Operations Centre at Al-Udaid in Qatar - which houses UK military personnel.
The base was already said to be at a state of "high readiness" for a strike from Iran.
The sounds of several explosions were heard over Qatari capital Doha just minutes after the missiles' launch, according to eyewitness reports.
While in Iraq, a "maximum alert status" has been declared at the Ain Al-Asad US base - with soldiers told to shelter in bunkers as a matter of urgency.
And in Syria, the main US base is "on full alert" in case of a possible attack by Iran or its proxies.
Blasts were heard over Doha just minutes after the missiles' launch, with footage appearing to show the US intercepting them
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"The White House and the Department of Defense are aware of, and closely monitoring, potential threats to Al Udeid Air Base in Qatar," a White House official said.
Donald Trump was later confirmed to have moved to the White House's "Situation Room" alongside his Defense Secretary and the US joint chiefs of staff.
Iranian state media said the strikes came as part of an operation called "Blessings of Victory" in response to the US's Operation Midnight Hammer on Sunday.
The country's armed forces, meanwhile, called the US bases in the Middle East a "major weakness and thorn in the side of the US's war-mongering regime, not a strength".
Qatar, meanwhile, has said it reserves the right to respond directly and in accordance with international law, having condemned the attack as a "flagrant violation" of its sovereignty.
LATEST AS TENSIONS SOAR IN THE MIDDLE EAST:
PICTURED: Traces of missiles in the sky after Iran launched strikes against a US base in Qatar
REUTERS
Just minutes after footage of the missiles began to emerge, reports began filtering through that Iran warned Qatar and the US ahead of this attack.
According to the New York Times, Iran told Qatari officials of the strikes ahead of time.
Three Iranian officials familiar with the plans said Iran "symbolically" needed to strike back at the US, but do so in a way which allowed all sides an "exit ramp".
The officials compared it to Iran's strategy in 2020 when Iran gave Iraq a heads-up before firing ballistic missiles at American bases following the killing of Qasem Soleimani.
Iran gave Iraq a heads-up before firing ballistic missiles at American bases following the killing of Qasem Soleimani
GETTY
"The number of missiles used in this successful operation was equal to the number of bombs that America used in its attack on Iran's nuclear facilities," a statement from Iran's top security council said.
The council added that the targeted base "was far from urban facilities and residential areas in Qatar".
"We confirm that no injuries or human casualties resulted from the attack," a Qatari Foreign Ministry spokesman later said.
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