Israel-Gaza updates: 22, including 18 children, reported dead in Rafah strikes
The IDF says it struck military targets of terrorist organizations in Gaza.
Israel launched a retaliatory strike against Iran early Friday morning local time, a senior U.S. official told ABC News.
The strike followed Iran's attack on Saturday, when Tehran sent a volley of more than 300 drones and missiles toward targets in Israel, according to Israeli military officials. All but a few were intercepted by Israel and its allies, including the United States, officials said.
Iran's weekend attack came more than six months after Hamas terrorists invaded Israel on Oct. 7, after which the Israeli military began its bombardment of Gaza.
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What to know about Iran's attack on Israel
Israeli officials said the country's Iron Dome defense system endured a big test from Iran's attack on Saturday, intercepting 99% of the 300 "threats of various types" thrown at it.
Iran's Islamic Revolutionary Guard Corps, according to Israel Defense Forces spokesperson Daniel Hagari, launched 170 unmanned aerial vehicles (UAVs), more than 120 ballistic missiles and more than 30 cruise missiles in the attack.
Hagari said "99% of the threats launched towards Israeli territory were intercepted -- a very significant strategic achievement."
Hagari said the attack resulted in only one known Israeli casualty, a 7-year-old girl who was severely injured when she was struck by shrapnel apparently from an intercepted missile.
Iran's Islamic Revolutionary Guard Corps says extensive missiles, drones launched
Iran's Islamic Revolutionary Guard Corps announced that it has launched extensive missile and drone operations against targets in Israel, according to Tasnim, the Iranian news-agency affiliated with the branch of Iran's armed forces.
An Israeli source also confirmed to ABC News that Iran fired cruise missiles from Iraq as well.
In a post on X, the Iranian Foreign Minister said "necessary warning has been given to America."
What US officials expect in the coming hours
The U.S. will try to help Israel intercept everything possible -- not just those that pass over U.S. ships -- despite Iran informing the U.S. that they should stay out of it, a senior U.S. official confirmed to ABC News.
In the coming hours the U.S. expects missile launches from Iran and southern Lebanon -- and maybe even the Houthis -- as well as drones, which take longer to reach target. The Iranians are trying to overwhelm the Israeli air defenses with drones and missiles coming in at different altitudes, speeds and directions -- but hitting targets at the same time, according to the official.
While the U.S. expects that most of these will be intercepted -- upwards of 85% -- the fear is that if any Israeli lives are lost, the Israeli response will be much bigger.
The target is believed to be three military bases, especially one where F-35s are kept. While these bases are relatively remote, there are towns nearby and these Iranian weapons are not completely accurate.
The U.S. has no doubt Israel will respond whether lives are lost or not. And that Iran itself will be targeted.
-ABC News' Martha Raddatz
Wide concern in the White House that Iran's retaliatory attack will cause widespread war
Sources at the White House say there’s deep concern that an Iranian retaliatory strike against Israel -- and the possible Israeli response -- will widen this war.
President Joe Biden cut his weekend vacation short to consult with his national security team in preparation for this. They’ve been on high alert and knew this attack was imminent.
U.S. officials the military is prepared to provide assistance to defend Israel against attacks if needed.
The U.S. is already moving military assets to the region to deter Iran and help protect U.S. forces. Officials say they have been urging Iran against further escalation or attacks on U.S. forces. They’ve been stressing that the U.S. was not involved in the Damascus, Syria, strike earlier this month.
-ABC News' Selina Wang
Iran's leader confirms attack on Israel, says 'evil regime will be punished'
Iran's leader has confirmed that a retaliatory attack on Israel has begun.
"The evil regime will be punished", Iran's Supreme Leader Ayatollah Ali Khamenei said in a statement on X.
Iranian state TV also confirmed the attack in a banner.
"The extensive drone operation of the Islamic Revolutionary Guard Corps against targets in the occupied territories has started a few minutes ago," the banner said.
US effort to build humanitarian pier off Gaza expected to top $180M
President Joe Biden's plan to use the military to build a giant pier off the coast of Gaza to deliver food, water and medicine will cost at least $180 million and could top $200 million, ABC News has learned.
The price tag was described by two people familiar with the initial estimate, which has not been released by U.S. Central Command.
The price tag is expected to fluctuate as U.S. officials scramble to finalize key details on the project, including which humanitarian organizations and foreign governments are willing to help carry the shipments to shore and distribute them.
The floating dock is expected to be nearly the size of a football field -- about 97 feet wide and 270 feet long -- stationed about 3 miles offshore. Container ships would screen their cargo in Cyprus before taking it to the floating dock and unloading it. From there, the aid would be moved aboard small Army ferries that would transport it to an 1,800-foot "trident" pier that connects to shore.
Officials also continue to discuss how to protect the service members who will be 3 miles offshore, where Hamas is believed to still operate.
The project -- which triggered the deployment of six Army and Navy ships and will involve some 1,000 U.S. military troops -- is on track to become operational in early May, enabling the delivery of some 2 million meals per day.
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-ABC News’ Anne Flaherty and Luis Martinez