The US military says it has launched a third consecutive night of strikes against Iran, hours before a reinstated naval blockade of Iranian ports takes effect, as Washington and Tehran both stake claims to control the Strait of Hormuz.

US Central Command, the military’s regional command known as CENTCOM, said its latest strikes began at 4:45pm ET (2045 GMT) on Monday, aimed at degrading Iran’s capacity to attack “innocent civilians and commercial shipping” in the strait.

Iranian state television and semi-official news agencies reported explosions through the night across the country’s southern coast, including the port city of Bandar Abbas, and on Kish and Qeshm islands, as well as the town of Jam in Bushehr province.

A projectile that struck western Bandar Abbas caused no casualties, Fars news agency reported, citing the regional governor’s office.

Iran’s Tasnim news agency reported that Iranian forces had struck several “violating” vessels in the strait, and that a US-made drone had been shot down near Bandar Abbas.

The United Arab Emirates said that two of its oil tankers had been hit by Iranian cruise missiles in Omani waters in the Strait of Hormuz. The UAE added that one Indian national crew member had been killed on one of the tankers, and that eight other people were wounded.

For its part, the Islamic Revolutionary Guard Corps (IRGC), said it had also launched a wider retaliatory campaign against US allies and interests across the Gulf.

The Iranian army said on Monday that it had carried out a drone attack on US military targets in Kuwait. In a statement posted by state broadcaster IRIB, the army said it launched drones at a US Patriot missile system, fuel tanks, a watchtower, an ammunition depot and communication systems.

Earlier on Monday, Iran struck targets in Bahrain, Jordan and Kuwait again.

President Donald Trump formally notified Congress on July 10 that fighting with Iran had resumed on July 7, invoking his authority to keep US forces in combat for another 60 days without lawmakers’ approval.

The blockade, confirmed by the US Navy-led Joint Maritime Information Centre (JMIC), is due to begin at 20:00 GMT on Tuesday.

It marks the rapid collapse of a ceasefire reached in June under a US-Iran memorandum of understanding, as the two sides now fight over a waterway through which roughly a fifth of the world’s oil once passed.

The US’s blockade covers Iran’s entire southern coastline, its ports and oil terminals, according to JMIC.

Vessels headed to destinations other than Iran will still be allowed through the strait, and humanitarian shipments will be permitted after inspection, it said, but ships suspected of helping Iran evade the blockade through ship-to-ship transfers face boarding, and those that fail to comply risk being disabled or destroyed.

The war of words over who controls the Strait of Hormuz continued on Monday, with Trump insisting again that the strait was open and announcing a 20 percent toll on cargo shipped through it in exchange for US protection.

Iran’s foreign minister, Abbas Araghchi, rejected the US’s president’s claim, saying Tehran “has always been the guardian of the strait and will remain so forever”.

At a press conference on Monday, Trump said Iran’s offensive capabilities were being dismantled, but he still thinks a “deal is possible” despite the return to open fighting.

Al Jazeera’s Mike Hanna, reporting from the White House, said the fighting did not necessarily rule out a return to talks.

“The ceasefire is over but the negotiations are still there,” he said, adding that Washington wanted to keep alive “the concept of negotiations” even if none were under way, because the administration remained keen to secure a deal.

Trump also repeated his demand that Gulf nations help cover the cost of protecting shipping, saying Washington was “protecting a very rich portion of the world” and expected to be paid for it.

The current escalation follows weeks of tit-for-tat strikes that steadily wore down the June ceasefire, as Iran and the US clashed over who has authority to control traffic through the strait.

Oil prices rose more than 9 percent on Monday, with Brent crude climbing to around $81 a barrel, its highest level since mid-June.

Kpler, the ship-tracking firm that owns MarineTraffic, said crossings through the strait fell by around 52 percent between July 10 and July 12 compared with the previous week, as vessels shifted toward Iranian coastal waters or went dark rather than risk more direct routes.