A prominent Iraqi militia backed by Iran, Harakat Hezbollah al- Nujaba, said on Thursday US President Donald Trump's decision to recognize Jerusalem as Israel's capital could become a "legitimate reason" to attack US forces in Iraq.
"The Worldwide Caution was updated with information on the continuing threat of terrorist actions, political violence, and criminal activity against USA citizens and interests overseas", a State Department spokesperson told The Hill.
"As terrorist attacks, political upheaval, and violence often take place without any warning, USA citizens are strongly encouraged to maintain a high level of vigilance and take appropriate steps to increase their security awareness when traveling", it reads.
In addition, the US embassy in London posted an urgent "security message" on its verified Twitter account, warning Americans in Great Britain "of the need for caution and personal awareness" after the president's controversial declaration.
"Americans in Jordan are encouraged to maintain a low profile and to remain alert to developments", the message said.
President Donald Trump announced that the US will officially recognize Jerusalem as the capital of Israel, a move that could spark increased tensions in the Middle East.
He also proclaimed Jerusalem as the capital of Israel.
For that reason, he reiterated what was established on June 4, 1967, with the restoration of an independent Palestinian state with Jerusalem as its capital.
Matt Lee, a diplomatic reporter for the Associated Press, noted on Twitter that such a warning was last issued in 2003 after the start of the Iraq War when the State Department believed an attack against US citizens by al-Qaida was imminent. "No civilized, democratic and peace-loving people will tolerate it".
In a statement, Al-Abadi warned on the repercussions this measure will have on the stability in the region and the world.
Iraq has also summoned the US ambassador in Baghdad and plans to hand over a memo protesting the new policy, Reuters reported.
A number of world powers, including Germany, Turkey, and Russian Federation, expressed grave concern over the Trump administration's decision.
The U.S embassy has been located in Tel Aviv for seven decades.