Israel-Gaza updates: Israeli forces preparing for 'wide range of offensive plans'

A 30-year-old Israeli told reporters it was "living hell" when Hamas gunmen opened fire and rockets were unleashed on a music festival in southern Israel, killing hundreds.

"I've been in wars, in two wars in my life, and never seen anything like this. Bodies at all places," the 30-year-old said. "They didn't care if you are a man or a woman, if you are young or an old man."

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Festival survivors look back on Hamas attackThe terrorist group launched its assault near Re-im, Israel, early Saturday morning, killing at least 260 people.

South First Responders via Telegram

At least 260 bodies were removed from the music festival venue, according to an Israeli rescue service.

Another survivor, Elad Hakim, told Reuters in Hebrew that the festival was "the best party I've been to in my life" until it went "from paradise to hell in one second."

"Girls started screaming," Hakim said. "People didn't understand where to go, what to do."

"There were two men on motorcycles on the road … who started spraying us [with bullets] as we drove by," Hakim said. "The vehicles that were behind [us] were left behind."

-ABC News' Will Gretsky

Israel is seeking a resupply of specific weapons from the United States, including artillery rounds, interceptors for its Iron Dome missile defense system and precision-guided munitions, a Biden administration official told congressional leaders on a Sunday night conference call, according to two sources familiar with the call.

More U.S. aid approved by Congress will be critical for Israel's defense in the coming weeks as the conflict continues, the sources said, describing the Biden administration's message to lawmakers.

-ABC News' Ben Siegel

Dozens of Israeli fighter jets have struck several targets in the Al Forqan area of the Gaza Strip, which serves as a hub for Hamas, the Israel Defense Forces said. Massive blasts were seen igniting over the area at the same time.

Many of the operations against Israel this weekend were launched from the Al Forqan area, the IDF said.

-ABC News' Jordana Miller

Lt. Col. Jonathan Conricus, spokesperson for the Israel Defense Forces, called Hamas' attack "unprecedented," and said the assault will be "followed by an unprecedented Israeli response."

"I could not imagine at that time [when the incursion began Saturday] that Hamas would have the audacity … to do what they have done," he told ABC News Monday. "To launch such an unprecedented, brutal, merciless attack on Israeli citizens. … And cause the amount of casualties that Israel has never experienced ever in its history."

In Israel, at least 700 people have died and more than 2,300 others have been injured since Saturday.

The Israel Defense Forces has since launched retaliatory airstrikes on Gaza. At least 560 people have died and another 2,900 have been injured in Gaza since Saturday, Palestinian authorities said.

The IDF said it's struck 130 targets in the last three hours.