Update(2300ET): Earlier the IRGC warned: "If any aggression is repeated, the response will be broader." That broader response has come in the overnight into Sunday hours: Tehran attacks Bahrain, Kuwait after US bombs Iranian coast, Al Jazeera reports:

Air raid sirens blare in Bahrain as Kuwait's military says its air defenses are responding to "hostile missile and drone threats."

Iranian state media is also confirming the fresh 'retaliation' for limited US airstrikes over the last two days, triggered initially by the Iranians seeking to enforce 'control' of the Strait of Hormuz, by attacking no less than two foreign vessels in as many days.

Latest via the same publication:

• The US has bombed Iran for a second day, hitting the city of Sirik, Bandar-e Lengeh and Qeshm Island, following a drone attack on a commercial vessel near the Strait of Hormuz.

• Israel has bombed southern Lebanon, killing at least one person, a day after signing a framework agreement with the Lebanese government to end hostilities.

• Lebanese President Joseph Aoun asks Trump to help prevent Israeli violations, as Hezbollah rejects the agreement with Israel, describing it as "a surrender of sovereignty".

Some unconfirmed emerging video showing some of the latest US action along Iran's coast, in a widening tit-for-tat: