Lebanese Prime Minister Nawaf Salam on Thursday declared a national day of mourning after deadly Israeli attacks on "unarmed civilians."

Israeli strikes on Lebanon on Wednesday killed at least 254 people and injured 1,165 others, with densely populated neighborhoods in the capital, Beirut, among the hardest hit, according to the latest data provided by the Lebanese Civil Defense.

Salam stressed that he remains in contact with Arab leaders and international officials to step up Lebanon's political and diplomatic efforts to stop the Israeli attacks.

The Israeli military said on Wednesday it has completed "the largest coordinated strike across Lebanon" since the start of the regional conflict, hours after a US-Iran truce came into effect.

A two-week ceasefire between the United States and Iran took effect early Wednesday. Israel claimed it would comply with the truce, but insisted the agreement does not cover Lebanon, although Pakistan, the mediator of the deal, said it does apply to Lebanon.

Here is how the world has reacted to the Israeli strikes and whether Lebanon is included in the ceasefire.

Lebanon: 'Full-fledged war crime'

Parliament Speaker Nabih Berri of Lebanon called the attacks on densely populated areas a "full-fledged war crime."

"Today's crime, coinciding with the ceasefire agreement declared in the region – an agreement that Israel and its political and security apparatus have failed to uphold – is a serious test for the international community and a blatant challenge to all international laws, norms, and conventions, which Israel violates daily through its unprecedented campaign of human assassination in modern history," Berri said, according to Al Jazeera.

Hezbollah: 'Barbaric aggression'

Lebanon's Hezbollah group said in a statement on Thursday that it fired rockets at northern Israel in response to "ceasefire violations."

In a statement on Wednesday, Hezbollah condemned what it called Israel's "barbaric aggression" and said the attacks underscored its right to respond.

Hezbollah had stopped attacking Israeli targets early on Wednesday, three Lebanese sources close to the group told Reuters.

"Hezbollah was informed that it is part of the ceasefire – so we abided by it, but Israel as usual has violated it and committed massacres all across Lebanon," said senior Hezbollah lawmaker Ibrahim al-Moussawi told Reuters.

Hezbollah lawmaker Hassan Fadlallah added that there would be "repercussions for the entire agreement" if Israel's attacks continued.

Hezbollah on Thursday said it had launched rockets at northern Israel in response to ceasefire violations.

Israel: Lebanon not part of ceasefire

In a televised address on Wednesday evening, Israeli Prime Minister Benjamin Netanyahu said Lebanon was not part of the ceasefire with Iran and ‌the Israeli military was continuing to strike Hezbollah with force.

Iran vows 'regret-inducing' response

Iranian President Masoud Pezeshkian on Wednesday said a ⁠ceasefire in Lebanon was an essential condition of his country's agreement with the United States.

Condemning the Israeli attacks, Iran's Foreign Minister Seyed Abbas Araghchi posted on social media platform X, "The Iran-US ceasefire terms are clear and explicit: the US must choose – ceasefire or continued war via Israel. It cannot have both."

"The ball is in the US court, and the world is watching whether it will act on its commitments," Araghchi said.

Iran's Islamic Revolution Guard Corps (IRGC) on Wednesday warned that if Israel does not immediately stop attacking Lebanon, it will receive a "regret-inducing" response.

In a statement published on its official news outlet Sepah News, the IRGC said that only a few hours after the announcement of the ceasefire agreement, Israel had started a "brutal massacre" in Lebanon. It warned the United States and Israel of a "regret-inducing" response if the attacks were not immediately stopped.

US: Lebanon not included in truce

The Israel-Hezbollah conflict in Lebanon is not covered by the temporary ceasefire deal between Washington and Tehran, US public broadcaster PBS quoted President Donald Trump as saying on Wednesday.

"They were not included in the deal," Trump said, according to a social media post by PBS News Hour correspondent Liz Landers. He added that it was "because of Hezbollah." 

"That'll get taken care of too," Trump reportedly said, adding: "That's a separate skirmish."

White House press secretary Karoline Leavitt and Vice President JD Vance also said on Wednesday that Lebanon was not included in the truce.

"I think this comes from a legitimate misunderstanding. I think the Iranians thought that the ​ceasefire included Lebanon, and it just didn't," Vance told reporters in Budapest.

Pakistan: Truce includes Lebanon

Earlier on Wednesday, Pakistani Prime Minister Shehbaz Sharif, a key intermediary in the US-Iran ceasefire talks, had said the truce would include Lebanon.

Sharif said on Wednesday that the United States, Iran and their allies had agreed to a ceasefire "everywhere," including Lebanon, following mediation by his government to stop weeks of fighting.

"I am pleased to announce that the Islamic Republic of Iran and the United States of America, along with their allies, have agreed to an immediate ceasefire everywhere including Lebanon and elsewhere, EFFECTIVE IMMEDIATELY," Sharif posted on X.

Iraq condemns Israeli attacks

The Iraqi government on Wednesday strongly condemned the Israeli attacks.

In a statement, Iraqi government spokesperson Basim al-Awadi said that Israel has pursued an aggressive approach, aimed at fueling conflict and instability, which he contended demonstrates the country's deliberate intent to undermine the newly achieved truce.

The attacks also reflect Israel's persistence in committing more crimes, in disregard of international law and global peace and security, al-Awadi said.

He urged the international community, relevant organizations and major countries to fulfill their responsibilities, and take decisive action to prevent further crimes and protect innocent civilians. 

UN: 'Nothing short of horrific'

The United Nations "strongly condemns" the strikes by Israel across Lebanon that resulted in significant civilian casualties, said the deputy spokesperson for United Nations Secretary-General Antonio Guterres, Farhan Haq.

"We continue to call on all sides to avail themselves of diplomatic channels, cease hostilities, and use the new US-Iran ceasefire as an opportunity to prevent further loss of life," he added, according to Al Jazeera.

The UN High Commissioner for Human Rights Volker Turk said "the scale of the killing and destruction in Lebanon today is nothing short of horrific" in a statement.

"Such carnage, within hours of agreeing to a ceasefire with Iran, defies belief. It places enormous pressure on a fragile peace, which is so desperately needed by civilians."

At least 1,530 people have been killed in Lebanon since the start of the recent escalation on March 2, Imran Riza, UN deputy special coordinator resident and humanitarian coordinator for Lebanon, said on Wednesday.

Riza added that the casualties included 130 children killed and 461 injured, citing the Lebanese Ministry of Public Health.

"It is a huge civilian tragedy," he told reporters at the UN headquarters via video link.

France: Lebanon 'must' be included in ceasefire

French President Emmanuel Macron on Wednesday condemned Israel's latest strikes on Lebanon, stressing that "Lebanon must be fully covered by" the Middle East ceasefire. 

France condemns "in the strongest possible terms" Israel's "indiscriminate strikes" in Lebanon on Wednesday that caused "a very high number of civilian casualties," Macron said on X after speaking by phone with Lebanese President Joseph Aoun and Lebanese Prime Minister Nawaf Salam.

These strikes "pose a direct threat to the sustainability of the ceasefire that has just been reached. Lebanon must be fully covered by it," Macron added.

Macron also spoke with Pezeshkian and US President Donald Trump on Wednesday after the announcement of the ceasefire.

"I told both of them that their decision to accept a ceasefire was the best possible one," he said on X.

"I expressed my hope that the ceasefire will be fully respected by each of the belligerents, across all areas of confrontation, including in Lebanon," Macron said.

Italy summons Israeli ambassador

Italy summoned the Israeli ambassador on Wednesday to demand an explanation over shots fired at an Italian convoy in ‌a UN mission in Lebanon, Deputy Prime Minister and Foreign Minister Antonio Tajani said, warning Israeli forces had "no authority to ‌touch" Rome's troops.

The UN peacekeeping force, known as UNIFIL, is ‌stationed in southern Lebanon to monitor hostilities along a demarcation line with Israel, an area that has seen major clashes between Israeli troops and Hezbollah fighters.

"Israeli warning shots ⁠have damaged one ‌of our vehicles; fortunately, no one was injured," Tajani said in the lower house of parliament.

He later wrote on X that he had ordered that the Israeli ambassador be summoned.

"It ‌is completely unacceptable that personnel operating under the UN flag should be put at ​risk by irresponsible actions such as today's, which are in clear violation of UN Resolution 1701," Prime Minister Giorgia Meloni said separately.

Meloni called for an end to the war in Lebanon, building on the US-Iran ceasefire.

Australia: Lebanon be included in ceasefire

Australian Foreign Affairs Minister Penny Wong on Thursday said that the ongoing conflict in Lebanon risks jeopardizing the ceasefire in the Middle East.

Wong told Australian Broadcasting Corporation radio that the two-week ceasefire announced by the US and Iran should also apply to Lebanon and that Australia is calling for both Hezbollah and Israel to observe the ceasefire.

"If fighting continues in Lebanon, it risks the whole ceasefire across the region," she said.

UK, Brazil, Colombia, Indonesia, Jordan, Sierra Leone and Australia issue joint statement

In a joint statement issued in the early hours of Thursday in Australia, Wong and her counterparts in the United Kingdom, Brazil, Colombia, Indonesia, Jordan and Sierra Leone called for an "urgent end" to hostilities in Lebanon.

The statement said that the signatory countries are deeply concerned by the worsening humanitarian situation in Lebanon and condemn "in the strongest terms" actions that have killed peacekeepers and increased the risks faced by humanitarian personnel in southern Lebanon.

(With input from agencies)