United Nations team leaders in Gaza were informed by their liaison officers in the Israeli military that "the entire population of Gaza north of Wadi Gaza should relocate to southern Gaza within the next 24 hours," a U.N. spokesperson said in a statement to ABC News.

"This amounts to approximately 1.1 million people," the spokesperson added.

"The United Nations considers it impossible for such a movement to take place without devastating humanitarian consequences," the spokesperson said.

-ABC News' Samy Zyara and Ellie Kaufman

Israelis in Tel Aviv held a candlelight vigil on Thursday for the victims of the Oct. 7 surprise terrorist attack by Hamas.

Ran Oren, who donated candles for the vigil, which was held around a fountain in central Tel Aviv, told Reuters that each candle donated represented each victim of the attack. He said the vigil was held in order to "light this dark moment."

Dozens of onlookers could be seen gathered around the makeshift vigil, some of them lighting candles along the fountain.

The vigil was first reported by Reuters.

Hospitals and the health system in the Gaza Strip are at a "breaking point," the UN World Health Organization said in a release Thursday.

"Hospitals have only a few hours of electricity each day as they are forced to ration depleting fuel reserves and rely on generators to sustain the most critical functions," the WHO said in the release. "Even these functions will have to cease in a few days, when fuel stocks are due to run out."

WHO said it documented 34 attacks on health care in Gaza since Saturday, Oct. 7. These attacks have resulted in "the death of 11 health workers on duty, 16 injuries and damages to 19 health facilities and 20 ambulances," the release said.

-ABC News’ Ellie Kaufman

Israeli authorities released images Thursday of babies they said were killed and burned by Hamas. The images were shown to Secretary of State Antony Blinken by Israeli Prime Minister Benjamin Netanyahu and the Israeli government during his visit to Israel.

The Israeli Foreign Ministry told ABC News the photos were taken by ZAKA, the organization that removed the bodies, in Kfar Aza, a kibbutz near the Gaza border where Israeli military officials said more than 100 people were killed by Hamas fighters.

Two Hamas officials, who did not provide their names, claimed in a video statement released Thursday that fighters were instructed to not target civilians and had tried to avoid harming them.

“Sadly the Hamas PR machine is now trying to claim that they did not target children and women specifically and that it was not their intention which is a blatant lie and a fake campaign to try and distance themselves from the massacre they carried out," the Israeli Foreign Ministry said. "That is why sadly we have to tweet pictures of babies they killed."

At least 30 Israeli police officers have been killed in the fighting, mainly in Sderot, where Hamas gunmen took control of the police station.

Meanwhile, fighting is still ongoing in six places, including Sderot -- which sits just two miles from the border with Gaza -- even after the police headquarters standoff ended and a rocket injured four people on Sunday morning.

On Saturday, graphic video showed dozens of dead bodies, bullet ridden homes and vehicles following an assault by armed militants.

Israel has also opened a hotline for family members who can come forward to give DNA samples to help identify those who have died.