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.

Human Rights Watch has accused Israel of using white phosphorus munitions in military operations in Gaza on Wednesday, saying it violated international humanitarian law by putting civilians at unnecessary risk.

In a report released Thursday, Human Rights Watch said it based its determination on a video it said it has verified, as well as two eyewitness accounts.

The Israel Defense Forces said in a statement to ABC News that claims they used white phosphorus in Gaza are "unequivocally false."

ABC News geolocated a video showing a jellyfish-shaped plume of white smoke over the port of Gaza. The video was posted on Wednesday by the official Palestinian news agency WAFA and matches images posted on social media and by other news outlets on the day.

Two experts -- Amael Kotlarski, the weapons team manager for the defense intelligence firm Janes, and Amnesty International weapons investigator Brian Castner -- told ABC News that images suggested munitions deployed over the port of Gaza on Wednesday appeared to contain white phosphorus.

"We have verified that Israeli artillery forces striking Gaza are equipped with M825 and M825A1155mm white phosphorus projectiles," Castner told ABC News, pointing to photographs by an Anadolu Agency photographer taken on Monday and showing Israeli troops handling shells labeled "M825A1."

Kotlarski said visual evidence alone was not sufficient to confirm that these specific shells were used in the Gaza port strikes.

There are "perfectly legal" military uses for white phosphorus munitions, Kotlarski said, including to create a smoke screen to conceal movements, to mark targets for artillery or air strikes, or to illuminate a battlefield. However, its use in urban areas is "problematic due to the higher risk of collateral damage," Kotlarski said, including the munitions' potential to cause severe burns.

White House Principal Deputy Press Secretary Olivia Dalton said Friday the U.S. had not independently verified allegations Israel used white phosphorous "so that is not something I would want to speculate about or weigh in on at this time."

-ABC News' Christopher Looft, Ben Gittleson and Jordana Miller