Sinwar was killed by Israeli Defense Forces in the Gaza Strip, according to Israeli Foreign Minister Israel Katz. He was considered the mastermind behind the Oct. 7, 2023, attack on Israel.

Israel Defense Forces confirmed Yahya Sinwar, dubbed the "Butcher of Khan Yunis," was killed on Thursday. Mick Mulroy and Javed Ali join ABC News' Kayna Whitworth.

Israel is attacking formerly safe locations in Lebanon as it expands its hunt for Hezbollah.

The Israeli foreign minister said Thursday that Hamas leader Yahya Sinwar was among three people killed in an operation in the Gaza Strip.

Biden spoke with Prime Minister Benjamin Netanyahu about how to use this opportunity to "bring the war to a close," the White House said.

Israeli officials confirmed Thursday that Hamas leader Yahya Sinwar was killed on Thursday.

U.S. officials have said Sinwar was the chief obstacle to a cease-fire deal between Israel and Hamas.

Vice President Kamala Harris spoke from Milwaukee following the announcement of Hamas leader Yahya Sinwar's death by Israeli officials Thursday.

Hamas leader Yahya Sinwar was killed by Israeli forces in the Gaza Strip on Thursday, Israel Foreign Minister Israel Katz said.

With senior leadership of Hamas shattered by a series of assassinations, Yahya Sinwar now appears to be the de facto boss of the terrorist organization, experts said.

The 62-year-old has served as Hamas' leader in Gaza since 2017 and assumed leadership of the group's Political Bureau after the assassination of Ismail Haniyeh in Iran in July.

The Houthis are backed by Iran and have taken credit for attacking ships in the Red Sea over the past year in response to the war in Gaza.

The U.S. military struck weapons storage facilities in Houthi-controlled Yemen, a U.S. official told ABC News.

Meanwhile the U.S. State Department warns Americans to leave Lebanon.

Around 100 U.S. troops will soon be on active duty in Israel to help defend the country against the potent missile threat from Iran and its regional allies.

ABC News' James Longman attends a funeral for members of a Lebanese family killed in an Israeli airstrike on nearby Hezbollah targets and visits what remains of some of their homes.

The World Health Organization said hospitals and health care workers are under attack in Lebanon with at least 23 attacks recorded as of Sept.17.

Israeli Prime Minister Benjamin Netanyahu's comments came during a phone call with President Emmanuel Macron of France, according to a readout of the conversation from Netanyahu's office.

Aaron David Miller of the Carnegie Endowment discusses the Biden administration’s threat to pull future weapons funding if Israel does not boost humanitarian aid to Gaza and protect civilians.

The Biden administration is threatening to pull future weapons funding if Israel does not boost humanitarian aid to Gaza and protect civilians.

U.S. officials demanded Israel improve the humanitarian situation in Gaza within 30 days or face potential consequences, including possibly suspending arms transfers, Israeli sources told ABC News.

UNICEF' James Elder joined ABC News Live to discuss the ongoing famine and hunger crisis in Gaza.

Israel has assured the Biden administration it will not hit Iranian oil or nuclear sites as the Middle East waits for Israel to retaliate for Iran’s missile barrage earlier this month.

The U.S. is sending an advanced antimissile system to Israel, along with about 100 American troops to help operate it. The move comes ahead of Israel's expected retaliation in Iran. 

U.S. Army leaders say the deployment of a Terminal High Altitude Area Defense battery to Israel and roughly 100 soldiers to operate it will add to strains on the Army’s air defense forces

ABC News' Matt Gutman speaks with the parents of late Hamas-held hostage Hersh Goldberg-Polin to discuss their grief. The 23-year-old American-Israeli was murdered after nearly one year in captivity.

Rachel and Jon Goldberg-Polin, the parents of slain Israeli-American hostage Hersh Goldberg-Polin, speak with ABC News' Matt Gutman about their grief.

Those in northern Gaza say they fear they could die "at any moment."

Nearly one quarter of the Lebanese population has been displaced by Israel's military campaign there, the country's caretaker prime minister has said.

Dozens of people protesting Israel’s war in Gaza have been arrested in a sit-in outside the New York Stock Exchange

Yousef Munayyer, an author and expert on Palestinian-Israeli relations, said he fears this deployment will only escalate tensions in the region.

A Pentagon official says the action was intended to “bolster Israel’s air defenses following Iran’s unprecedented attacks.”

Israeli Prime Minister Benjamin Netanyahu is examining a plan to seal off humanitarian aid to northern Gaza in an attempt to starve out Hamas militants

The system, which deploys 100 U.S. troops to operate, is intended to help Israel fend off any future attacks from Iran.

The United Nations accused Israeli troops of firing directly at their positions and damaging their bases as Israel expanded its invasion in southern Lebanon.

Israeli airstrikes hit central Beirut, destroying a building and killing more than 20 people. ABC News' James Longman reports from Beirut.

Oil prices have surged in recent weeks as conflict escalates in the Middle East.

The attacks killed 22 and injured more than 100, according to the Lebanese health ministry. A senior Hezbollah official was reportedly the target.

As the war between Israel and Hezbollah intensifies, Lebanese civilians are increasingly paying the price – and this dangerous reality often becomes clear in the middle of the night: That’s when the Israeli military typically warns people to evacuate b...

As the Israel-Hamas war hits the 1-year mark, ABC News takes a look at the state of hospitals in Gaza.

ABC News correspondent Patrick Reevell has the latest from the war in the Middle East.

President Biden and Israeli Prime Minister Benjamin Netanyahu spoke on Wednesday, according to the White House.

The head of the U_N_ agency for Palestinian refugees is warning that if pending Israeli legislation is adopted, all humanitarian operations in Gaza and the West Bank may “disintegrate.”

Three hospitals in northern Gaza -- Al-Awda Hospital, Indonesian Hospital and Kamal Adwan Hospital -- have reportedly been told by the IDF to evacuate.

The Israel Defense Forces continued its bombardment of Beirut's southern suburbs overnight into Wednesday, with a focus on the Hezbollah-controlled Dahiya area.

I heard the sound of a missile falling. I turned off my phone and sat on the floor waiting for it to explode. When it exploded, the whole house shook.

A love triangle that ended with murder. The heart-stopping, all-new “20/20” premieres Friday, Oct. 11th at 9/8c on ABC Network. Stream on Hulu.

ABC News’ Matt Gutman spoke to retired IDF Maj. Gen. Doron Almog about the failures and hubris that led to Oct. 7.

The IDF sends troops into Lebanon, 14 states sue TikTok over children's mental health and Mega Million announces a price increase for tickets next year. Our panel weighs in on today's top headlines.

Monday marks 1 year of the Israel-Hamas war. Here's a look at the tragic human toll by the numbers, including deaths and injuries and the state of getting aid into Gaza.