State Department tells Americans worldwide to 'exercise increased caution'

The war entered its fourth week on Saturday.

Last Updated: March 22, 2026, 8:29 PM EDT

President Donald Trump announced "major combat operations" against Iran on Feb. 28, with massive joint U.S.-Israel strikes attack targeting military and government sites, officials said.

Ayatollah Ali Khamenei was among those killed in Tehran on the first day of strikes and his son Mojtaba Khamenei was chosen to succeed him. Iran is responding with missile and drone attacks targeting Israel, regional U.S. bases and multiple Gulf nations. Iran is also attempting to block some shipping traffic through the Strait of Hormuz.

Israel is also intensifying its long-running strike campaign against the Iran-backed Hezbollah militia in Lebanon.

Watch special coverage on Nightline, "War with Iran," each night on ABC and streaming on Disney+ and Hulu.

Mar 17, 2026, 8:13 AM EDT

IDF details Larijani killing in 'precise' strike

The Israel Defense Forces said on Tuesday that Ali Larijani, the influential Iranian security official who’d been a key representative of former Supreme Leader Ali Khomenei, was killed in a "precise" Israeli aerial strike.

The IDF statement followed the Israeli defense minister's announcement of the death.

PHOTO: Supreme leader Ayatollah Ali Khamenei and Parliament Speaker Ali Larijani attend the sixth international conference in support of Palestinian intifada (uprising), in Tehran.
This handout photo provided by the official website of the Center for Preserving and Publishing the Works of Iran's supreme leader, Ayatollah Ali Khamenei, on February 21, 2017, shows (L to R) Iranian President Hasan Rouhani, supreme leader Ayatollah Ali Khamenei , Parliament Speaker Ali Larijani and judiciary chief of judiciary Sadeq Larijani attending the sixth international conference in support of Palestinian intifada (uprising), in Tehran.
Ho/KHAMENEI.IR/AFP via Getty Images

"Following the elimination of Khamenei, Larijani consolidated his status as the de facto leader of the Iranian regime and led the combat efforts against the State of Israel and countries across the region," the IDF said in a statement.

Describing him as the "de facto leader" of the Iranian regime, the IDF said that Larijani was killed by an Israeli Air Force strike near Tehran.

Israel described Larijani’s death as a "further blow" to the Iranian leadership’s abilities to manage the war against the U.S. and Israel.

Mar 17, 2026, 5:56 AM EDT

Israel says Iran's security chief Ali Larijani killed in overnight attack

The head of Iran's Supreme National Security Council, Ali Larijani, was killed in an overnight attack on Iran, along with the paramilitary leader Gholamreza Soleimani, the Israeli minister of defense said on Tuesday.

"Larijani and the Basij commander were eliminated last night and have joined Khamenei, the head of the annihilation program, along with all those eliminated from the axis of evil in the depths of hell," Israel Katz, the minister, said in a statement.

Ali Larijani, former chairman of the parliament of Iran, speaks at a press conference after registering as a candidate for the presidential election at the Interior Ministry, in Tehran, Iran May 31, 2024.
Majid Asgaripour via Reuters

"The Prime Minister and I have instructed the IDF to continue pursuing the leadership of the terror and oppression regime in Iran, and to repeatedly cut off the head of the octopus and prevent it from regrowing," he said.

Larijani was an influential representative of Iran’s late supreme leader, Ayatollah Ali Khamenei.

"The IDF continues to operate in Iran with great intensity, targeting regime assets, suppressing missile-launch capabilities, and destroying key strategic infrastructure across all domains, setting Iran back decades," Katz said.

-ABC News' Somayeh Malekian

Mar 17, 2026, 3:09 AM EDT

UAE, Saudi Arabia and Qatar report Iranian aerial attacks

The ministries of defense in the United Arab Emirates, Saudi Arabia and Qatar reported Iranian aerial attacks early on Tuesday.

Saudi officials said in a series of updates that it had intercepted and destroyed more than a dozen drones, many of which were in the eastern region.

Debris falling from an intercepted missile caused a "minor" fire in an industrial area in Qatar, officials said, adding that no injuries had been reported.

Air defenses in the UAE were responding early on Tuesday to "incoming missile and drone threats from Iran," officials said.

"MOD asserts that the sounds heard are the result of the Air Defence Systems intercepting missiles and drones," the UAE said.

Mar 17, 2026, 2:53 AM EDT

Additional IDF troops arriving in Lebanon, Israel says

More Israel Defense Forces troops have been deployed in Lebanon, where Israel yesterday began a "limited" ground operation targeting what it described as Hezbollah "strongholds."

Israeli soldiers gather amid military vehicles on the Israeli side of the border with Lebanon, following an escalation between Hezbollah and Israel, and amid the U.S.-Israeli conflict with Iran, in northern Israel, March 16, 2026.
Shir Torem/Reuters

"Additional IDF troops have been deployed in Lebanon, continuing efforts to establish a forward defense posture in order to remove threats and create an additional layer of security for residents of northern Israel against Hezbollah’s threat," the IDF said on Tuesday.

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