Explosions were heard across Iran overnight, shortly after neighbouring Gulf states began to report attacks.
The US military targeted an unladen oil tanker which it said was heading for the key Iranian oil terminal on Kharg island.
Control of the waterway has become a key point of contention between the US and Iran, as a ceasefire deal falters.
Relatives of Craig Foreman say his punishment is being extended for talking to the media from jail.
US President Donald Trump says he is yet to decide whether or not he will "finish off" Iran.
Trump's comments aired as the two countries exchanged fire for the fourth day in a row and the US resumed blockading Iranian ports.
The abrupt about-face from the US president was the latest twist in a conflict that has now lasted more than four months.
A senior officer in the Hamas-run police force was among those killed in the strike, which Israel's military says targeted "terrorists".
The third consecutive night of US strikes on Iran came as Trump announced a 20% charge as part of a new blockade on the Strait of Hormuz.
The Iran-backed Houthis blame Saudi Arabia for the attack in Yemen's capital and say they targeted Abha airport in response.
Within hours of the latest US attacks, Iran said it had struck US military assets in Kuwait, Jordan, Bahrain and Oman.
The pair, named only as Twana H.S. and Asia R. A., left Germany for Iraq in 2015 and became members of the Islamic State group.
The negotiating process is fragile and recent US strikes show how hard it will be to reach agreement, writes BBC's International Editor Jeremy Bowen.
Three days of public mourning in Tehran was a political spectacle Iran's leaders wanted the world to see, writes the BBC's international correspondent Lyse Doucet.
Khamenei's funeral is another reminder of the change Iran has seen, but what does its new leadership want?
The BBC travels to the city of Bandar Abbas - the first time journalists from a UK broadcaster have been to the Iranian side of the strait.
Targets hit include ballistic missile infrastructure, nuclear sites, and naval bases.
The BBC's Barbara Plett Usher examines the latest tensions over the key international shipping channel.
US Central Command says it attacked military targets in Iran and at sea.
The BBC's chief international correspondent looks at how Iran's new leadership will respond to several issues affecting the country
Hundreds of people cheered for Egypt, which shares a border with Gaza, in the match against Argentina.
He took power in 1996 after staging a bloodless coup against his father, and went on to transform Qatar into the gas-rich power it is today.
Khanna, 49, was visiting the occupied West Bank when he was held for 90 minutes, he says.
Ali Khamenei was buried at the Imam Reza shrine, Iran's holiest Shia Muslim site, ending six days of public mourning ceremonies.
Aid worker Mohammed al-Wahidi had become a prominent humanitarian figure during the Israel-Hamas war.
The BBC's chief international correspondent looks at how Iran's new leadership will respond to several issues affecting the country.
The remains of Iran's late supreme leader are transported to Najaf and Karbala, as funeral ceremonies continue for a fifth day.
