President Donald Trump has said the latest strikes by the US hit Iran "very hard", adding that the attacks were "in honour" of three US soldiers killed in recent days – two in Jordan, one in Iraq.
US Central Command (Centcom) said its strikes – conducted for the ninth consecutive night – had targeted military sites and communications networks to "further diminish" Iran's attacks on vessels in the Strait of Hormuz. Blasts were heard across Iran.
Iran said it had responded with a "surprise attack" in Syria and targeted US aircraft at Jordan's Aqaba airport.
Later on Monday, Trump warned that "every time Iran kills an American Soldier they will pay for that killing many times over".
Elsewhere in the region, Kuwait's armed forces said they had intercepted Iranian drones.
On the US strikes, Iran's semi-official Tasnim news agency reported that several cities had been hit including Tabriz, Chabahar, Konarak, Bandar Mahshahr and Bandar Imam Khomeini.
There were also Iranian state media reports that two oil tankers had exploded as the vessels tried to cross the strait.
Iran's Islamic Revolutionary Guard Corps (IRGC) said the tankers were going through what it called an "unsafe and hazardous southern route" of the strait and "exploded and were brought to a halt". Centcom disputed the claims.
The IRGC added that the strait "will not be safe for the transit of petrochemical products, nor even a single drop of oil and gas" as long as the US strikes continue and that it will respond with a "punitive operation".
Over the weekend, the US confirmed that a service member had been killed after an Iranian attack in northern Iraq on Saturday.
That news came after the US said a separate attack on a base in Jordan on Friday had killed two soldiers there. The two have now been identified by the Pentagon as Pte Isabella Gonzales, 19, and Lt Tyler James Feehan, 25.
A third service member was declared missing after the attack in Jordan, and US officials say "unidentified remains" have been found during the search process.
As the strikes continued over the weekend, US Secretary of State Marco Rubio said that the US "always remains open to a diplomatic solution".
He also said "the world has to decide whether or not it's going to allow an international waterway to be under the control" of Iran, saying Tehran was using the crucial shipping route as leverage.
His comments come as a preliminary deal made in mid-June to stop fighting has unravelled, with negotiations for a permanent peace making little progress after Trump declared the agreement was "over" on 8 July.
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