The Israeli leader's pledge came as US President Donald Trump attended the return of six American service members killed in a drone strike -- the first US troops to die in the conflict.

Trump, wearing a white "USA" baseball cap, saluted as flag-draped cases carrying the soldiers' remains were carried off a military transport plane at Dover Air Force Base.

The troops were killed last Sunday when a drone struck a US command centre in Kuwait, a day after the United States and Israel launched their military campaign against Iran.

The war showed no sign of easing Saturday, as Iran launched wave after wave of missiles and drones across the Gulf while US and Israeli forces carried out fresh strikes on Iranian targets.

One strike set a Tehran airport ablaze, while others hit two oil depots in the capital -- the first reported attacks on the Islamic republic's oil infrastructure.

Iran's Revolutionary Guards said they had struck a US naval base in Bahrain after accusing Washington of targeting an Iranian desalination plant earlier in the day.

There were air raid warnings and explosions reported across the region, including in Jerusalem, Doha and Manama. Saudi Arabia said it intercepted a drone east of Riyadh, while the United Arab Emirates said its air defences destroyed 15 missiles and 119 drones.

Video footage showed one projectile crashing at Dubai airport, while AFP journalists heard blasts in Baghdad, Erbil and Dubai on Saturday evening.

Iranian President Masoud Pezeshkian earlier apologised to neighbouring countries hosting US military bases but government officials maintained their defiant tone.

The country's security chief Ali Larijani accused Washington and Israel of seeking the "fundamental disintegration of Iran."

- Air war intensifies -

Israel launched some of its largest raids since the war began, targeting a military academy, an underground command centre and missile storage sites.

Fire and smoke billowed from Tehran's Mehrabad International Airport after a predawn attack that Israel said destroyed 16 aircraft and fighter jets. Netanyahu said Israel had achieved almost total control of the skies over the Iranian capital.

Trump also struck a defiant tone, repeating his claim that Iran had been close to developing a nuclear weapon and warning on Truth Social: "Today Iran will be hit very hard!"

He said Washington did not want Kurdish fighters joining the conflict and suggested US troops could eventually be needed to secure Iran's enriched uranium stockpiles.

Trump also mocked reports Britain might send aircraft carriers to the region, posting: "We don't need people that join wars after we've already won!"

Separately, he blamed Iran for what the country's authorities said was a deadly strike on an elementary school in the southern county of Minab last Saturday that killed at least 150 people. The comment came after a New York Times investigation suggested US forces were most likely responsible.

Neither Washington nor Israel has claimed responsibility for the attack and AFP could not independently verify the circumstances.

Now entering a second week, the war was sparked by joint US-Israeli strikes that killed Iran's supreme leader Ali Khamenei.

The conflict has since spread across the region and beyond, reaching Lebanon and even the seas off Sri Lanka, where US forces sank an Iranian warship.

Inside Iran, damage to infrastructure and residential areas is mounting as its people report growing anxiety and a heavy security presence.

"I don't think anyone who hasn't experienced war would understand it," a 26-year-old teacher told AFP on condition of anonymity.

Iran's health ministry said Friday that at least 926 civilians had been killed and around 6,000 wounded -- figures AFP could not independently verify.

- Regional tensions widen -

Israel has intensified air strikes on Lebanon, hitting Hezbollah infrastructure in the Dahiyeh area of Beirut's southern suburbs late Saturday after the military warned remaining residents to evacuate.

Iran-backed Hezbollah said it had fired 100 rockets and drones at Israeli territory, targeting naval bases and air defence systems. The group claimed more than 30 attacks against Israeli positions and troops, including positions near Haifa and Tel Aviv.

Israeli commandos carried out a raid in eastern Lebanon overnight in an unsuccessful attempt to retrieve the remains of a navigator lost in 1986, killing 41 people in the process.

Lebanon's health ministry said at least 294 people have died in Israeli air strikes over the past week, prompting Prime Minister Nawaf Salam to warn of a looming "humanitarian disaster".

- Economic shockwaves -

The conflict is reverberating far beyond the battlefield.

Global stock markets have slumped and oil prices have surged, as Iran attempts to choke shipping through the Strait of Hormuz -- a key artery for global energy supplies.

Iran's Revolutionary Guards said they had struck two oil tankers with explosive drones in the Gulf.

Analysts warn there is still no clear path to ending a conflict that US and Israeli officials say could last a month or longer.

Trump has suggested Iran's economy could be rebuilt if a leader "acceptable" to Washington replaces the late supreme leader.

But Iran's ambassador to the United Nations, Amir Saeid Iravani, said the choice of leadership would be made "solely by the will of the Iranian people."

China and Russia have largely stayed on the sidelines despite close ties with Tehran. Trump told reporters he had "no indication" of reports that Moscow may be sharing intelligence with Iran on US troop movements.