Iran's top negotiator Mohammad Bagher Ghalibaf said on Tuesday that the strategic Strait of Hormuz will not be opened until the United States meets Tehran's demands, including lifting a naval blockade.

"I want to state clearly that the Strait of Hormuz will not be opened until the American commitments stipulated in the memorandum of understanding... are implemented," Ghalibaf said in a speech broadcast on state television. He listed the removal of the blockade, the lifting of oil sanctions and unfreezing of Iran's assets abroad among the demands.

Syrian state media said three people were killed on Tuesday in an explosion of unknown origin at a power plant on the country's Mediterranean coast.

News agency SANA reported "an explosion in the thermal power plant in Banias", with the cause under investigation. It cited a regional health official as saying the blast resulted in three deaths.

Turkish President Recep Tayyip Erdogan has urged U.S. President Donald Trump in a telephone call to continue to seek a diplomatic solution to the conflict with Iran.

The call between the two presidents came late Monday as the 60-day negotiating period to find a peace deal between the United States and Iran was expiring, with no word of an extension and both sides seemingly as far apart as they were at the start.

A ship was hit by a projectile early Tuesday as it was sailing out of the Strait of Hormuz, according to the British military's UK Maritime Trade Operations center.

There was no immediate claim of responsibility but the attack highlights the ongoing danger of attempting to transit the waterway as Iran continues to throttle shipping traffic, even as it finalizes negotiations with Oman on a plan to manage the critical passage.

Hamas said Tuesday it remained committed to a Gaza peace deal backed by the United States after envoy Jared Kushner spoke to Israel about pressuring the group on disarmament.

"Hamas is committed to this agreed-upon process. It is clear that, so far, the Israeli side has not given the mediators clear approval of the roadmap," Hamas spokesman Hazem Qassem told AFP.

A Syrian court on Tuesday issued a death sentence to detainee Wassim al-Assad, a cousin of longtime ruler Bashar al-Assad who was himself sentenced to death in absentia a week ago.

Judge Fakhr al-Din al-Aryan said Wassim al-Assad was convicted of multiple murders and "murder accompanied by torture and brutality... classified as crimes against humanity and war crimes", adding that "he is therefore sentenced to death".

Syria accused Israel of striking an airfield in its northwestern province of Idlib on Tuesday, after a security source told AFP the out-of-service military facility had been hit.

"Israeli occupation aircraft early this morning targeted the runway of the Abu Duhur military airport... with eight strikes," Syrian state television quoted an unidentified military source as saying, adding that "the attack resulted in material damage to the airport's infrastructure, without causing casualties".

Yemen's Iran-backed Houthis targeted an oil refinery on Saudi Arabia's southern Red Sea coast on Tuesday, rebel media reported, as the rebels ramp up attacks on the kingdom.

The Houthis "targeted the Aramco refinery in Jazan with a number of drones... in response to airspace violations over the governorates of Saada and Hajjah" in Yemen, Houthi news agency Saba said, citing a military source.

Iranian foreign ministry spokesman Esmaeil Baqaei condemned a drone attack that targeted the Iraqi Kurdistan prime minister's office, state media reported.

Baqaei denounced the attack, "describing it as a highly suspicious development that requires vigilance and careful attention", according to a statement carried by state news agency IRNA.

Israeli Prime Minister Benjamin Netanyahu agreed on Monday with U.S. envoy Jared Kushner that a U.S. general should supervise Hamas' disarmament and said Israel would not pull troops from Gaza until then, an Israeli official told AFP.

The two sides "agreed that the first step toward the demilitarization of the Strip would be to require Hamas to hand over its weapons for decommissioning under the supervision of an American general," the Israeli official said.