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.
Israel says Iran fired dozens of drones
Iran has launched dozens of drones toward Israel, but it could take hours for them to reach, according to Israel Defense Forces spokesperson Daniel Hagari.
Israel is closing down its airspace after midnight local time and Israel's defense systems are deployed, according to Prime Minister Benjamin Netanyahu.
"We are prepared for any scenario, both in defense and attack," Netanyahu said in a video statement.
"The IDF is on high alert and is constantly monitoring the operational situation. The IDF Aerial Defense Array is on high alert, along with IAF fighter jets and Israeli Navy vessels that are on a defense mission in Israeli airspace. The IDF is monitoring all targets," the IDF said in a statement.
"We ask the public to adhere to and follow the instructions of the Home Front Command and the official IDF announcements regarding the matter," the statement added.
Jordan temporarily closes its airspace to all incoming, departing, transiting aircrafts
Starting Saturday night, the Jordanian airspace will be temporarily closed to all incoming, departing and transiting aircraft, Jordan's Civil Aviation Regulatory Authority said in a statement.
Hamas ready for 'serious and real' swap deal, group says in response to Israeli proposal
Hamas says it has handed Egyptian and Qatari mediators its response to an Israeli proposal it received at talks in Cairo last week, while reiterating its key demands of a permanent cease-fire, a withdrawal of Israeli forces from Gaza, the return of displaced people to their areas and places of residence and intensifying the entry of relief and aid.
"We also confirm our readiness to enter a serious and real prisoner exchange deal between the two parties," Hamas said in a statement.
-ABC News' Edward Szekeres
Hezbollah says it hit Iron Dome after Israel says it struck military compounds
Hezbollah says it attacked Iron Dome platforms "with drones" hitting "the targets accurately."
Earlier Saturday, the Israel Defense Forces said a number of anti-tank missiles crossed from Lebanon, as well as Hezbollah unmanned aerial vehicles.
The IDF also said it struck a series of Hezbollah military compounds on Saturday.
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