State Department tells Americans worldwide to 'exercise increased caution'

The war entered its fourth week on Saturday.

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.


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Trump says Israel will not attack Iranian gas field again unless Iran attacks Qatar

President Donald Trump in a social media post late Wednesday night, called for Israel to not attack the South Pars Gas Field unless Iran again attacks Qatar's liquefied national gas facilities.

“NO MORE ATTACKS WILL BE MADE BY ISRAEL pertaining to this extremely important and valuable South Pars Field unless Iran unwisely decides to attack a very innocent, in this case, Qatar,” Trump said.

Trump said if Iran does so, the U.S. will respond and “massively blow up” the South Pars gas field.

"I do not want to authorize this level of violence and destruction because of the long term implications that it will have on the future of Iran, but if Qatar’s LNG is again attacked, I will not hesitate to do so," Trump said in the post.

Trump began his post saying the U.S. was not made aware in advance of Israel’s attack on South Pars on Wednesday, an escalation in the conflict.

Trump also claimed that Qatar was also not aware Israel would strike the Iranian gas field.

“The United States knew nothing about this particular attack, and the country of Qatar was in no way, shape, or form, involved with it, nor did it have any idea that it was going to happen,” Trump wrote.

Iranian state media said Wednesday that Israel attacked Iran’s South Pars Gas Field, one of the nation’s largest gas resources and a key lifeline for Iran.


Iran war powers resolution once again fails in the Senate

The Senate once again rejected an Iran war powers resolution, the second the chamber has considered this month.

The resolution would direct the removal of United States Armed Forces from hostilities within or against Iran that have not been authorized by Congress. Because the resolution was privileged, it only would have needed the support of 51 senators to advance. Still, the resolution was blocked by a vote of 47-53.

Sen. John Fetterman was the only Democrat to vote against the resolution. Sen. Rand Paul was the only Republican to vote for it.

-ABC News' Allison Pecorin


Gas facilities near Abu Dhabi shut down due to falling missile debris

Gas facilities near Abu Dhabi have been shut down due to falling debris from the interception of missiles, the Abu Dhabi media office said.

The missiles targeted the Habshan gas facilities and the Bab oil field, according to the office, which said operations at the gas facilities have been suspended.

No injuries have been reported, the office said.

The United Arab Emirates' Ministry of Foreign Affairs said it "strongly condemned the Iranian terrorist attack" targeting facilities and that the attacks "constitute a dangerous escalation and a violation of international law."


3 killed in West Bank by falling missile shrapnel: PRCS

At least three people were killed and another 13 injured by falling missile shrapnel in the West Bank, according to the Palestinian Red Crescent Society.

The Palestinian Authority Ministry of Interior said the casualties occurred in the town of Beit Awwa "following the impact of an interceptor missile."

These mark the first reported fatalities in the West Bank since the Iran war began, according to The Associated Press.