For a second day in a row, the United States has launched strikes against Iran, once again citing an attack against a commercial vessel as a motivation.

Saturday’s renewed attacks are the latest indication that a regional Middle East ceasefire, established as part of a June 17 memorandum of understanding (MOU), might be at a breaking point.

In a statement, the US Central Command (CENTCOM), which directs military action in the Middle East, explained that the latest attacks came “at the Commander in Chief’s direction”.

“CENTCOM forces launched strikes today in direct response to continued Iranian aggression against commercial shipping,” the military command centre wrote.

“U.S. military aircraft targeted Iranian military surveillance infrastructure, communication systems, air defense sites, drone storage facilities, and minelayer capabilities.”

Explosions were reported in southern Iran around the village of Tahrui, near the port of Sirik, which was also the focal point of Friday’s US attacks. State media also indicated that Qeshm Island had been hit.

Saturday’s strikes against Iran followed a similar playbook to Friday’s. Early on Saturday morning, around 4:30am Eastern US time (8:00 GMT), the Panama-flagged tanker Kiku was travelling through the Strait of Hormuz when it was reportedly hit by an unidentified projectile.

No crew members were injured, and no leakage was reported from its cargo.

CENTCOM said the ship had been carrying more than 2 million barrels of crude oil when it was hit by a “one-way attack drone”.

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The website MarineTraffic.com indicates that the tanker had left the Al Shaheen oil field on Thursday and is due to dock at Fujairah, in the United Arab Emirates, on Sunday.

A similar sequence of events prompted Friday’s volley of US attacks.

In that case, a Singapore-registered contained ship, the Ever Lovely, was struck by a drone as it sailed through the Hormuz Strait on Thursday. No one on board was injured, and the boat continued on its travels.

Still, US President Donald Trump denounced the drone strike on Friday as a “foolish violation” of the June 17 memorandum.

By that evening, the US and Iran had exchanged fire, with the US targeting the area around Sirik and Iran hitting US military installations in the Middle East.

CENTCOM referenced Friday’s actions in announcing the latest round of strikes.

“After yesterday’s U.S. strikes in response to the Iranian attack on M/V Ever Lovely, Iran was given a chance to honor the ceasefire agreement,” CENTCOM wrote.

Iran “elected not to”, it added, citing the Kiku drone strike. CENTCOM also maintained that commercial traffic through the Strait of Hormuz, a sticking point in ceasefire negotiations, would continue, with US military backing.

“U.S. forces remain vigilant, lethal, and ready,” CENTCOM said in its statement.

Central to the latest round of fighting is control over the Strait of Hormuz, a key artery for maritime traffic. Nearly 20 percent of the world oil supply passed through the narrow waterway, as well as significant quantities of fertiliser and natural gas.

But after the US and Israel launched attacks on Iran on February 28, launching the present-day war, Tehran moved to shut down traffic through the strait, which sits between its shores and Oman’s.

Iran’s decision sent global fuel prices skyrocketing, and that generated pressure, both domestic and international, for the Trump administration.

The June 17 memorandum was designed to provide relief. Though it was a prelude to further negotiation, the deal called for the US, Iran and their allies to “declare the immediate and permanent termination of military operations on all fronts, including in Lebanon”.

It also outlined a 60-day period during which time Iran was to make its “best efforts” at allowing commercial traffic to transit through the Strait of Hormuz at no charge.

That part of the memorandum specified that Iran and Oman, the two countries that border the strait, would determine “future administration and maritime services” in the waterway.

But continued fighting in Lebanon has prompted Iran to threaten the strait’s closure once more.

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