Iran’s permanent mission to the United Nations has denied Tehran is involved in the Hamas militant group’s surprise attack on Israel.

The statement is the latest in a series of conflicting claims that has emerged after the unprecedented stealth assault raised concerns that Iran may have been involved, given Tehran’s long-time support for Hamas and its cause.

“Iran unwaveringly stands in solidarity with Palestine; however, it is important to note that Iran is not involved in Palestine’s response, as these actions are solely determined by the Palestinians themselves,” Iran’s Mission to the United Nations said in a statement dated Oct 9.

This stands in contrast to the claims made by Ghazi Hamad, a Hamas spokesman, who reportedly told the BBC the militant group had direct backing for the attack from Iran.

The Wall Street Journal reported Sunday that Iranian security officials helped with the planning and approved the attack at a meeting in Beirut last Monday. Three U.S. officials, however, told NBC News late Sunday they were unable to corroborate the Journal account.

— Clement Tan

Saudi Arabia announced its support for the Palestinian people in a call with President Mahmoud Abbas, Palestinian news agency WAFA reported.

“President Abbas expressed appreciation for the firm position and efforts exerted by Saudi Arabia in support of the Palestinian people and their just cause,” the report stated.

“The Saudi Crown Prince affirmed that his country will continue to stand by the Palestinian people and that it is exerting great efforts to ensure the return of calm and stability.”

Abbas is the head of the Palestinian Authority, the internationally recognized government of the Palestinian people. He is also the head of Fatah, the other major Palestinian party that’s a key rival to Hamas. The Palestinian Authority currently administers part of the West Bank.

On Saturday, Saudi Arabia stated it does not support the attacks, and has joined global calls for a de-escalation.

— Lee Ying Shan

The White House said President Joe Biden will address the world tomorrow afternoon following the recent terror attacks in Israel.

The conflict in Israel, which has claimed the lives of at least 1,000 people, has triggered the movement of U.S. firepower to the region in an effort to bolster Israeli security.

— Amanda Macias

The FBI said that it has no credible intelligence indicating there is a threat to the United States homeland stemming from the recent Hamas attacks in Israel.

“We are closely monitoring unfolding events and will share relevant information with our state, local, federal and international law enforcement, intelligence and homeland security partners to ensure they are prepared for any impacts to public safety,” the FBI said in a statement obtained by NBC News.

“We will not hesitate to adjust our security posture, as appropriate, to protect the American people,” the statement added.

The FBI also said that it is “aggressively” investigating reports of deceased, injured, or missing Americans in Israel.

— Amanda Macias

The leaders of France, Germany, Italy, the United Kingdom and the United States reiterated their support for Israel and “for a peaceful and integrated Middle East region” during a call earlier today.

“We make clear that the terrorist actions of Hamas have no justification, no legitimacy, and must be universally condemned. There is never any justification for terrorism,” the leaders wrote in a joint statement.  

“Our countries will support Israel in its efforts to defend itself and its people against such atrocities. We further emphasize that this is not a moment for any party hostile to Israel to exploit these attacks to seek advantage,” wrote French President Emmanuel Macron, German Chancellor Olaf Scholz, Italian Prime Minister Giorgia Meloni, British Prime Minister Rishi Sunak and American President Joe Biden.

— Amanda Macias

U.S. stocks largely shrugged off concerns from the Israel-Hamas war. The Dow Jones Industrial Average ended Monday’s session up nearly 200 points, and the S&P 500 climbed 0.6%.

Energy stocks rallied on the back of a 4% jump in oil prices. Exxon Mobil gained 3.5%, and Occidental Petroleum ended the day 4.5% higher.

Defense names also rose broadly. The iShares U.S. Aerospace & Defense ETF (ITA) jumped 4.5% with Northrop Grumman surging 11%.

— Fred Imbert

Read more about the war’s impact on the financial markets at CNBC’s live market blog.

Former President Barack Obama condemned the terrorist attack in Israel and called for “just and lasting peace for Israelis and Palestinians alike.”

“All Americans should be horrified and outraged by the brazen terrorist attacks on Israel and the slaughter of innocent civilians,” Obama wrote in a statement.

“We grieve for those who died, pray for the safe return of those who’ve been held hostage, and stand squarely alongside our ally, Israel, as it dismantles Hamas,” he added.

— Amanda Macias

— Scott Mlyn and Adam Jeffery

President Joe Biden confirmed at least 11 Americans were killed in Israel. “Sadly, we now know that at least 11 American citizens were among those killed—many of whom made a second home in Israel,” Biden said in a statement released by the White House.

Commenting on hostages, Biden said: “I have directed my team to work with their Israeli counterparts on every aspect of the hostage crisis, including sharing intelligence and deploying experts from across the United States government to consult with and advise Israeli counterparts on hostage recovery efforts.”

Read the full statement from the president:

— Riya Bhattacharjee

Delta Air Lines said its suspension of nonstop flights to Israel will last until at least the end of October following the Hamas attacks and Israeli retaliation.

“Delta will continue to explore options for customers to safely exit TLV via seats that become available on our partner airlines,” the carrier said, referring to the country’s main airport.

Major U.S. passenger carriers and several large European airlines had halted service or scaled back over the weekend following the attacks.

United Airlines on Sunday said that it would resume service only when “conditions allow” but didn’t elaborate.

“We are not actively considering an evacuation of U.S. citizens from Israel or other countries in the Middle East at this time,” the State Department said in a statement on Monday afternoon.

— Leslie Josephs

The ongoing conflict in the Middle East “is not the typical Hamas-Israel scuffle, but potentially something larger,” according to Bank of America. The risk of a potentially longer conflict may lead the U.S. government to increase defense investments to build munitions and weapon systems at faster rates and in higher volumes, said analyst Ronald Epstein.

“Ultimately, the US will be supplying munitions, missiles, and anti-missile systems to two allies (Ukraine and Israel) on top of supplying its own needs. As in any resource-constrained environment, difficult choices may have to be made as to who gets what from Pentagon inventories,” Epstein said in a Monday note.

The analyst provided a handful of stocks that have exposure in this event.

“The more immediate focus of investors due to this potential increase in defense spending are General Dynamics, Northrop Grumman, Lockheed Martin, Raytheon Technologies, and L3 Harris through their exposure to missiles, missile propulsion systems, land systems (wheeled and tracked armored vehicles), and munitions,” said Epstein.

— Hakyung Kim

Read more about the war’s impact on the financial markets at CNBC’s live market blog.

Oil prices spiked more than 3% on Monday after the militant group Hamas launched a surprise attack on Israel. The impact on gas prices in the U.S. will likely remain limited, however, as neither Gaza nor Israel produce much petroleum, experts say.

The overseas turmoil has yet to be reflected at American gas pumps. The average price for a gallon of regular gasoline in the U.S. on Monday was $3.70, down 11 cents from a week ago, according to AAA.

That said, drivers in the U.S. should keep an eye on the situation if they’re price-sensitive.

— Ana Teresa Solá

A full-blown war between Israel and Hamas has further stoked volatility in global markets, and one Wall Street firm said it could drive investors away from risk assets, mimicking the climate surrounding the Russia invasion of Ukraine in February, 2022.

“The conflict’s course is uncertain, but will very likely escalate, possibly contributing to a significantly risk-off global environment over the next 1-3 months,” Dan Alamariu, chief geopolitical strategist at Alpine Macro, said in a note. “Think of Russia’s invasion of Ukraine in 2022.”

— Yun Li

Read more about the war’s impact on the financial markets at CNBC’s live market blog.

United Nations Secretary-General Antonio Guterres called for all parties to allow urgent UN humanitarian access to trapped Palestinian civilians in the Gaza Strip.

“The humanitarian situation in Gaza was extremely dire before these hostilities, now it will only deteriorate exponentially,” Guterres told reporters at the UN in New York.

“Relief and entry of essential supplies into Gaza must be facilitated and the UN will continue efforts to provide aid to respond to these needs,” Guterres said, adding that the region needs medical equipment, food, fuel and other humanitarian supplies.

“I appeal to the international community to mobilize immediate humanitarian support for this effort,” Guterres added.

— Amanda Macias

Israeli Prime Minister Benjamin Netanyahu said he has been in constant communication with U.S. President Joe Biden on the heels of surprise attacks over the weekend.

“I would like to thank him on behalf of all citizens of Israel. The USA supporting Israel in every way,” Netanyahu said of Biden in a short televised speech.

The Israeli leader also warned of mounting disinformation, propaganda and fake news as tensions escalate in the region. He called for a national unity government in order to address the crisis.

“At the end of the war, all our enemies will know that it was a terrible mistake to attack Israel,” he added.

— Amanda Macias

Defense stocks surged Monday as the Israel-Hamas conflict sparked concerns of geopolitical instability, making them the broad market index’s biggest gainers as of Monday afternoon.

President Joe Biden met this morning with Secretary of State Antony Blinken, National Security Advisor Jake Sullivan, Principal Deputy National Security Advisor Jon Finer, Homeland Security Advisor Liz Sherwood-Randall and White House Chief of Staff Jeff Zients to discuss updates on the ongoing situation in Israel, the White House said in a statement.

The White House said Biden will speak to several allies in the afternoon to share developments.

— Amanda Macias

A spokesman for Hamas said that the group will broadcast the execution of a hostage until Israel stops killing civilians in Gaza.

“From this hour onwards, we announce that every targeting of our people who are safe in their homes without warning, we will regretfully meet with the execution of one of our enemy’s civilian hostages, and we will broadcast this, under duress, in audio and video,” spokesman Abu Obeida said in a statement.

The statement further warned Israeli leadership of additional violence.

— Amanda Macias