Tehran reports attacking a US naval base in Bahrain, as Iran launched strikes throughout the Middle East in retaliation for a large-scale and ongoing assault targeting the nation by the US and Israel.
Huge plumes of black smoke were seen rising from an area close to the headquarters of the US Navy's Fifth Fleet in Manama, Bahrain. The scope of any impact is not yet known and the American officials has not commented.
Elsewhere across the region, the United Arab Emirates, Qatar and Kuwait - each hosting US military bases - said they have engaged and destroyed missiles in their air space.
In the Qatari capital, the Qatari Ministry of Defence announced it had intercepted several missiles seemingly aimed at the al-Udeid air base, the largest American base in the Middle East.
The Iranian Revolutionary Guard declared it was striking US bases and assets as part of operation "Truthful Promise 4", in retaliation for the attack on the Islamic Republic carried out by the US and Israel on Saturday morning.
That US-Israeli operation - executed at around 06:15 GMT - has so far targeted areas linked to the Tehran's leadership, with President Trump encouraging the Iranian people to revolt against the regime.
In Israel, sirens were heard nationwide after the Israeli military said it had identified an incoming Iranian missile barrage.
The Ministry of Defence of the United Arab Emirates said in a statement that the nation has been targeted by a "a blatant attack involving Iranian ballistic missiles".
"Emirati air defenses engaged the projectiles with great effectiveness and shot down a number of missiles," it added.
The statement noted debris fell on a neighborhood in the capital, causing some structural damage and the death of one civilian.
The United States Air Force is stationed at the Al Dhafra base, to the south of the Emirati capital, along with the UAE Air Force.