UK Foreign Secretary David Lammy reiterated the UK's call for a ceasefire in Lebanon during a conversation with the country’s Prime Minister Najib Mikati.

“We agreed on the need for an immediate ceasefire to bring an end to the bloodshed,” Lammy said in post on X.

“A diplomatic solution is the only way to restore security and stability for the Lebanese and Israeli people.”

The two spoke on Saturday, shortly after news broke that an Israeli strike in Beirut had killed Hezbollah leader Hassan Nasrallah.

Speaking at the United Nations’ General Assembly earlier in the week, Lammy joined a chorus of world leaders warning about the perils of a full-blown war in the Middle East and urged Israel and Lebanon to suspend hostilities.

Residents from neighbourhoods around Beirut have been sleeping in the streets and parks following Israeli strikes in the area.

Watch below as BBC Middle East correspondent Nafiseh Kohnavard reports from Lebanon's capital:

Image source, Getty Images

Iran's Supreme Leader Ayatollah Ali Khamenei has been moved to a secure location amid security concerns in the aftermath of a strike on Beirut that killed Hezbollah's leader, Reuters reports.

Israel launched several attacks on Iran's ally, Hezbollah.

Two regional officials told Reuters that Khamenei was re-located and that Tehran was in contact with Hezbollah to decide next steps after Hassan Nasrallah's death.

Khanmenei vowed in a statement to avenge the death of the Hezbollah leader.

Image source, Getty Images

Moments ago, as he left a church in Rehoboth Beach, Delaware, US President Joe Biden was asked by a reporter if a ground invasion into Lebanon by Israel was inevitable.

Biden replied: "It's time for a ceasefire now."

The US and allies called on Wednesday for a 21-day ceasefire between Israel and Hezbollah, but any such prospect appears considerably less likely now.

Image source, Getty Images

Israeli strikes have left 33 people dead on Saturday, according to the Lebanese health ministry.

An additional 195 people were wounded, it added.

Israel has been aiming its attacks in Dahieh, a densely populated southern suburb of Beirut that is also a stronghold for Hezbollah.

How Hezbollah will respond remains unclearpublished at 22:01 British Summer Time 28 September

22:01 BST 28 September

Hugo Bachega
Middle East correspondent, in Beirut

Hezbollah’s conflict with Israel was always seen as a dangerous game. But the group seemed to believe it had the right strategy, and that it could even benefit.

Before the recent escalation, it had limited its attacks to border areas, giving indications, often by Hassan Nasrallah himself, that it was not interested in a major war with Israel.

It is possible it could not have imagined any Israeli response would come with such force.

By not deploying its most sophisticated arsenal, Hezbollah seemed to have calculated it could prevent any major escalation that would see its infrastructure, weapons and leaders targeted. This is exactly what has happened.

In less than two weeks, Israel demonstrated it had penetrated the group’s communications network and carried out airstrikes that killed around 800 people across the country, including senior Hezbollah figures, such as the commander of its main fighting unit. And, now, the group's leader.

Hezbollah, a Shia Muslim group whose name means Party of God, is described as a terrorist organisation by the UK, the US and others, but is more than just a militia in Lebanon.

It is a political party with representation in parliament, and is included in the government. It is also a social movement, engrained in Lebanese society, with significant support. How it will respond remains unclear.

Frank Gardner
Security correspondent

The assassination of Hezbollah leader Hassan Nasrallah is a seismic event.

Why does it matter? Hezbollah has grown under Nasrallah's leadership from being a fairly insignificant militia into the most powerful non-state army in the world.

They are the long arm of Iran in the Arab world. They have a massive arsenal of missiles - supplied by Iran, through Syria - some of which are long-range precision weapons that could hit Tel Aviv.

Assassinating Nasrallah sends a message to Iran from Israel: we are going to cross whatever red lines we want in order to remove the threat of Hezbollah on Israel’s northern border.

We have marched a few steps closer to a wider war, but it is not inevitable. Everything hinges on what Iran decides.

Listen to more of Frank's analysis on Newscast.

It's late night in the Middle East. If you're just joining our coverage, here's a quick round-up of developments from Saturday.

• Hezbollah confirmed its leader Hassan Nasrallah died in a massive Israeli airstrike on Beirut on Friday
• The Iran-backed group described him as a martyr and vowed to continue its fight against Israel
• A senior general in Iran's Revolutionary Guards Corps, Abbas Nilforoushan, was also killed in the strike, Iran state media said
• Israeli Prime Minister Benjamin Netanyahu said the killing of "master murderer" Nasrallah had "settled the score"
• US President Joe Biden described the strike as a "measure of justice" for victims of Nasrallah, but Iran Supreme Leader Ayatollah Ali Khamenei vowed revenge
• Lebanon’s caretaker prime minister, Najib Mikati, said his country is in danger as three days of mourning were declared

• Israel launched more air strikes in southern Lebanon, saying on Saturday it had killed a Hezbollah intelligence official, Hassan Khalil Yassin, though the group has not confirmed this yet
• The European Union has advised airlines to suspend flights in Lebanese and Israeli airspace

The Israel Defense Forces say sirens sounded near Jerusalem late on Saturday.

They went off in Judea and Samaria, to the east of Jerusalem, after a missile was launched from Lebanon into Israeli territory, the IDF says.

Judea and Samaria is an administrative division that the IDF uses to refer to the occupied West Bank.

The projectile fell in the area and caused a fire, the IDF says.

More now from Netanyahu's statement.

He says he gave the directive for the attack that targeted Hassan Nasrallah, as the blows the Israel Defense Forces had been landing on Hezbollah in recent days were "not enough".

He describes Nasrallah's death as a "necessary condition" to achieve Israel's goals.

Netanyahu calls Nasrallah a "master murderer" and says he was "the central engine of Iran's axis of evil".

In the last few minutes, Israel's Prime Minister Benjamin Netanyahu has delivered a statement following Nasrallah's death. He landed back in Israel a few hours ago, following his trip to the UN in New York.

He describes the killing of Hassan Nasrallah as a "historic turning point".

And he says Israel had "settled the score" with those responsible for the deaths of "countless Israelis" and many foreign citizens.

He says Israel is determined to continue striking its enemies.

Earlier, the Israeli military said they had intercepted a missile fired by the Houthis in Yemen. Air raid sirens had been sounded in the area, including Tel Aviv.

The Houthis - who are an ally of Iran and Hezbollah - have now said in a statement that they fired a ballistic missile at the Ben Gurion International Airport.

It was timed with the arrival of Israeli Prime Minister Benjamin Netanyahu to the airport, they said, according to both Reuters and AFP. Netanyahu was returning to the country after speaking to the United National General Assembly in New York on Friday.

This is the second time in the last two days the Houthis have fired at Israel, Reuters reports. Another missile was intercepted on Friday.

As well as Biden, we've had a flurry of international reaction to Hassan Nasrallah's death:

• UN Secretary General Antonio Guterres said he was "gravely concerned" at the "dramatic escalation"
• British Foreign Secretary David Lammy repeated calls for an immediate ceasefire.
• Cuba's President Miguel Diaz-Canel condemned what he called the "cowardly selective assassination" of Nasrallah
• Iran's Supreme Leader Ayatollah Khamenei declared five days of public mourning, vowing Nasrallah's death would not go unavenged

• The European Union has advised airlines to suspend flights in Lebanese and Israeli airspace

The killing of Hezbollah's leader has sent shockwaves through the region.

Here's some photos of the reaction.

Image source, Getty Images

Image source, Getty Images

Image source, Getty Images

Image source, Getty Images

Some more comments from Joe Biden.

He says Israel's strike that killed the Hezbollah leader on Friday was in response to Nasrallah's decision to open up a "northern front" against Israel after Hamas’s attack from the south last 7 October.

“Ultimately, our aim is to de-escalate the ongoing conflicts in both Gaza and Lebanon through diplomatic means,” the US president says, adding that it's time for "the broader Middle East region to gain greater stability".

But Biden did not refer to a 21-day ceasefire plan between Israel and Hezbollah that he and US allies called for on Wednesday - an initiative that now seems in tatters.

He did signal that he hasn't given up hope of a ceasefire and hostage release deal for Gaza.

The UK government has reiterated calls for British people in Lebanon to leave the country on the "first available flight".

The Foreign Office says its advice remains that British citizens should register their presence.

"We know it's a distressing time for British nationals and all people in Lebanon, which is why we are doing everything we can to help," a spokesman said.

Carine Torbey
BBC Arabic correspondent, in Beirut

In many parts of the country, the Lebanese army is heavily deploying as fears of tension rise.

There are several factors that could threaten internal security. First, the sheer anger and feeling of loss for many supporters of Hezbollah who might take to the streets to express their fury at the killing of their leader by Israel.

But also, not everyone in the country is mourning the loss of Hasan Nasrallah and there’s increasing worry of provocations within the society pitting pro-Hezbollah and anti Hezbollah groups against each other.

This is the last thing Lebanon needs at the moment as Israel is relentlessly bombing parts of it, killing and injuring scores of people and displacing hundreds of thousands.

This fear seems to be widely shared as almost all political figures in the country have urged for national unity and warned against frictions.

The BBC's international correspondent Orla Guerin has been to a village close to the Israel-Lebanon border which was hit by an air strike in the early hours of Friday morning.

Press play to watch:

Image source, Reuters

Biden's comments follow shortly after US Defence Secretary Lloyd Austin said the American military "remains postured to protect US forces and facilities in the region and committed to the defence of Israel".

The Pentagon said on Saturday morning that Austin had expressed full US support for Israel's right to defend itself in calls to his Israeli counterpart, Yoav Gallant, on Friday.

The defence secretary also said Washington was determined to prevent Iran from exploiting the situation in Lebanon", said Pentagon spokesman Maj Gen Pat Ryder.

Image source, PA Media

US President Joe Biden has described Hassan Nasrallah's killing as a "measure of justice for his many victims".

He says these include "thousands of Americans, Israelis and Lebanese civilians".

Biden emphasises the US "fully supports" Israel's right to defend itself against Hezbollah, Hamas, the Houthis of Yemen and "any other Iranian-supported terrorist group".

The US president also says he has directed the Pentagon to enhance the defence posture of US military forces in the Middle East to "deter aggression".