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.

Personnel at the U.S. Embassy in Israel are now under a curfew from 8 p.m. to 6 a.m. and "are urged to stay as close to home as possible outside the curfew hours," the U.S. Embassy said in a new alert.

In addition to a ban on personal travel to Gaza and the surrounding areas, the new alert said all U.S. government personnel are also prohibited from personal travel to the West Bank.

"U.S. citizens in Israel who have family members missing in the Gaza periphery can go to the Israel National Police’s combined assistance center at 4 HaNegev Street in Airport City," the alert said.

-ABC News' Shannon Crawford

Israel Defense Forces' helicopter gunships are attacking Lebanese territory on Monday after the IDF said two rockets were fired from Lebanon.

The Lebanese army said, "The outskirts of the towns of Al-Dhaira and Aita Al-Shaab and other border areas are being subjected to air and artillery bombardment by the Israeli enemy. The Army Command calls on citizens to take the utmost precaution and caution and not to go to areas adjacent to the border in order to preserve their safety."

Of the two rockets fired from Lebanon toward Israel, one of the rockets fell in Lebanese territory and no injuries were reported.

The first U.S. charter flight to evacuate Americans from Israel has departed the country and is now en route to Europe, John Kirby, spokesperson for the National Security Council, told reporters on Friday. Kirby didn’t provide the exact destination in Europe.

He said more flights are expected to depart "in the coming days" and that "the State Department will continue to organize these charter flights for as long as there is a demand from US citizens for departure assistance."

He said the U.S. is still exploring "other options" to expand evacuation capacity, which also includes an option by sea.

Kirby also spoke to the heightened alert across the U.S.

"I want to be completely and crystal clear on one thing: At this time, none of our intelligence agencies have any specific intelligence indicating a threat to the United States stemming from the Hamas terrorist attack in Israel," Kirby stressed.

-ABC News' Justin Gomez