Israel Defense Forces called for "all residents of Gaza City to evacuate their homes" and "move south for their protection" early Friday morning local time in a series of posts on X.

The IDF told residents to move "and settle in the area south of the Gaza River."

The announcement was made, according to the IDF, because it plans to "operate significantly in Gaza City in the coming days" and wanted "to avoid harming civilians."

The IDF said in its posts that it believes Hamas terrorists are hiding in Gaza City, including in buildings with "innocent civilians” inside.

"[D]istance yourself from the Hamas terrorists who use you as a human shield," the post read.

The message was released a short time after the UN made a similar announcement, also citing Israel's military.

-ABC News' Ellie Kaufman

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

In remarks with Israeli Prime Minister Benjamin Netanyahu, Secretary of State Antony Blinken said at least 25 Americans had now been confirmed dead in Israel.

Netanyahu described some of the atrocities committed by Hamas.

"Hamas has shown itself to be an enemy of civilization: The massacring of young people in an outdoor music festival, the butchering of entire families, the murder of parents in front of their children and the murder of children in front of their parents. The burning of people alive, the beheadings," he said.

"Hamas should be treated exactly the way ISIS was treated," he said. "They shouldn't be spit out from the community of nations. No leader should meet them. No country should harbor them. And those that do should be sanctioned."

Blinken said he was speaking not only as an American diplomat, but as a Jew, a husband and a father of young children, saying it was impossible for him to look at photos of families killed "and not think of my own children."

"The same time that we've been shocked by the depravity of Hamas, we've also been inspired by the bravery of Israel citizens," he said. "The grandfather who drove over an hour to a kibbutz under siege, armed only with a pistol and rescued his kids and grandkids. The mother who died shielding her teenage son with her body, giving her life to save his -- giving him life for a second time."

Blinken remarked that some U.S. aid had already been delivered, and that more military aid was on his way. He said the administration would work with Congress to meet Israel’s additional needs and that bipartisan support for Israel was "overwhelming."

The secretary called on world leaders to condemn Hamas.

Blinken also reiterated that Israel "has the right -- indeed, the obligation -- to defend itself" but that it was "so important to take every possible precaution to avoid harming civilians."

-ABC News' Shannon Crawford