Iran and the US continued their attacks in the Gulf as each accused the ​other of violating an increasingly precarious interim deal signed less than two weeks ago to end their four-month-old war, reported Reuters.

Shortly after President Donald Trump warned the US might "militarily complete the job", Iran early on Sunday ‌launched missiles and drones on US military sites in Kuwait and Bahrain, continuing a series of escalating attacks.

Beyond the Gulf, Israel said it had struck Iran-backed Hezbollah militants in southern Lebanon as fighting continued in an area Tehran says is key to its peace deal with Washington.

The U.S. military said earlier it had struck Iran again, hours after a tanker was hit in the Strait of Hormuz, the world's most important energy shipping route, which Iran had largely cut off for most of ​the conflict.

The 14-point US-Iran interim agreement was meant to halt the fighting, which the U.S. and Israel started on February 28, and reopen the strait to shipping while ​talks proceeded on more deep-seated issues, such as Iran's nuclear programme.

The Iranian Foreign Ministry condemned what it described as the "brutal attacks" a violation of the ceasefire, adding it showed that the US "does not place the slightest value and credibility on its commitments, and breaking promises is part of its nature, reported BBC.

IRGC too in a strongly worded statement accused the US of violating the ceasefire agreed to in the memorandum of understanding between the two nations, warning that it "will lead to a complete halt to the process".

In the IRGC's statement, it said the US had attacked five coastal posts in Iran under what it called "the pretext of the IRGC Navy confronting the offending ship".

In retaliation, the IRGC said it had launched ballistic missiles and drones at "eight key pieces of infrastructure" at the Ali al-Salem base in Kuwait and the Fifth Naval Fleet in Port Salman, Bahrain, "destroying them".

A US official has told Reuters that there were no reported US casualties or major impacts or damage to US facilities in the Middle East.

The IRGC said that under the MoU signed earlier this month, Iran has arrangements for controlling passage and navigation in the Strait of Hormuz, and from now on, violating ships will be dealt with more forcefully than in the past.

"Any potential enemy aggression, under any pretext, even if the aggressions are against minor targets, as happened last night and tonight, will have a crushing response," read the statement.