This is a view of the destruction after an Israeli airstrike that targeted six adjacent buildings just three minutes before the ceasefire took effect speaks in Tyre, Lebanon.

• Israel and Lebanon extended the ceasefire by three weeks.
• Negotiations between Iran and the US are at a standstill.
• A third warship, the USS George HW Bush aircraft carrier, has arrived in the Middle East.

Israel and Lebanon extended a shaky ceasefire by three weeks, US President Donald Trump said on Thursday, as the United States remained at a standstill in negotiations with Iran to end the Middle East war.

Trump announced the truce extension as he met with ambassadors of the two countries and despite recent Israeli strikes in Lebanon and fresh rocket fire from Iran-backed Hezbollah, which was not part of the talks in Washington.

“I think there’s a very good chance of having peace. I think it should be an easy one,” Trump told reporters on Thursday.

The initial truce was set to expire on Sunday.

Still, the US president said earlier he was in no rush to end the war with Iran, adding that “the clock is ticking” for the Islamic Republic as a third American aircraft carrier arrived in the Middle East.

READ | Iran slams US ‘blatant violation of the ceasefire’, vows to keep Strait of Hormuz closed

Iranian media reported blasts over the capital Tehran, a first since the ceasefire in the Middle East war came into effect two weeks ago.

It was not clear what caused the explosions, though an Israeli security source told AFP that their country was not currently striking Iran.

Prospective peace talks in Pakistan were hanging in the balance, meanwhile, with no sign of a return to diplomacy to end a standoff in the Strait of Hormuz.

Since the ceasefire, the US and Iran have shifted their focus to the Strait of Hormuz, a waterway through which a fifth of the world’s oil and liquefied natural gas exports ordinarily flow.

Iran has effectively closed it in retaliation for the war.

“I have all the time in the World, but Iran doesn’t - The clock is ticking!” Trump said on social media.

Trump, who on Thursday ruled out the use of a nuclear weapon against Iran, had earlier ordered the US Navy to destroy any Iranian boat caught laying mines in Hormuz.

The USS George HW Bush aircraft carrier has arrived in the Middle East, the US military said on Thursday, bringing the number of the massive American warships operating in the region to three.

A second carrier was operating in the Red Sea on Thursday, while a third is also in the region, according to social media posts by US Central Command (CENTCOM).

Iran’s state news agency IRNA said the “sound of air defence firing” was heard in western Tehran, while the Mehr news agency reported that air defence systems were activated in several parts of the capital to counter “hostile targets”.

Earlier, US forces boarded a vessel in the Indian Ocean that was transporting oil from Iran and a senior Iranian official said Tehran had banked its first proceeds from the tolls it exacts on shipping through the strait.

Trump had said he “ordered the United States Navy to shoot and kill any boat, small boats though they may be... that is putting mines in the waters of the Strait of Hormuz”.

Israel’s Defence Minister Israel Katz, meanwhile, said: “We are awaiting a green light from the United States - first and foremost to complete the elimination of the Khamenei dynasty... and additionally to return Iran to the Dark Age and the Stone Age.”

Iran has vowed it would keep the strait closed to all but a trickle of approved vessels for as long as the US Navy blockades its ports, brushing off demands from Trump to both reopen Hormuz and surrender its enriched uranium.

The US has imposed its own blockade of Iranian ports, and on Thursday, the Pentagon announced that US forces had “carried out a maritime interdiction and right-of-visit boarding of the sanctioned stateless vessel M/T Majestic X transporting oil from Iran, in the Indian Ocean”.

Deputy parliament speaker Hamidreza Hajibabaei said Iran received its first revenue from tolls it is imposing on ships seeking to cross Hormuz.

Responding to remarks from Trump suggesting that Iranian leadership was “seriously fractured”, the Islamic Republic’s president, parliament speaker and chief justice all posted a nearly identical message on social media on Thursday.

“One God, one nation, one leader, and one path; that path being the path to the victory of our dearer-than-life Iran,” they all said.

A post on Supreme Leader Mojtaba Khamenei’s X account took aim at “the enemy’s media operations” that “seek to undermine unity and national security”, after the New York Times reported that he was seriously wounded in a strike that killed his father and predecessor, but is mentally sharp.

Trump told the New York Post on Wednesday that talks could resume in Pakistan within two to three days, though no delegations were presently headed to Islamabad.

In the Pakistani capital, blanket security remained in place for the fourth straight day in anticipation of possible talks.

Iran’s Revolutionary Guards said on Wednesday they forced two ships to the Iranian shore from the Strait of Hormuz.

CENTCOM said its forces had so far “redirected 33 vessels since the start of the blockade against Iran”.

European leaders, meanwhile, will be joined on Friday by counterparts from Lebanon, Egypt, Syria and Jordan for what a senior EU official described as “intensive dialogue” as Europe grapples with the strait’s closure.