On Friday, Israel’s occupation forces called for all civilians of Gaza City, more than 1 million people, to relocate south within 24 hours, as it amassed tanks near the Gaza Strip ahead of an expected ground invasion.

“Now is a time for war,” Israeli Minister of War Yoav Gallant said on Thursday as Israeli warplanes continued pounding Gaza in retaliation for the weekend attacks by Hamas fighters that killed more than 1,300 Israelis.

The Israeli occupation forces said they would operate “significantly” in Gaza City in the coming days and civilians would only be able to return when another announcement was made.

“Civilians of Gaza City, evacuate south for your own safety and the safety of your families and distance yourself from Hamas terrorists who are using you as human shields,” the military said in a statement.

“Hamas terrorists are hiding in Gaza City inside tunnels underneath houses and inside buildings populated with innocent Gazan civilians.”

A Hamas official said the Gaza relocation warning was “fake propaganda” and urged citizens not to fall for it.

The United Nations said it considered it impossible for such a movement of people to take place “without devastating humanitarian consequences.”

Israel’s ambassador to the U.N., Gilad Erdan, described the U.N.’s response to Israel’s early warning to the residents of Gaza as “shameful.”

Israel has vowed to annihilate the Hamas militant group, which led the devastating attacks on Saturday.

The Israeli occupation army said in a statement on Friday that it struck 750 military targets in northern Gaza overnight, including what it said were Hamas tunnels, military compounds, residences of senior operatives and weapons storage warehouses.

However, a ground invasion of Gaza poses serious risk with Hamas holding scores of Israeli prisoners taken in the assault.

The Gaza Strip, home to 2.3 million people, is under siege by Israel, which has pounded Hamas targets in the enclave and killed more than 1,500 Palestinians in retaliatory attacks since the weekend incursions.

The Gaza Strip, home to 2.3 million people, is under siege by Israel, which has pounded Hamas targets in the enclave and killed more than 1,500 Palestinians in retaliatory attacks since the weekend incursions.

The International Committee of the Red Cross (ICRC) said fuel powering emergency generators at hospitals in Gaza could run out within hours and the United Nations World Food Program (WFP) warned food and fresh water were running dangerously low.

“The human misery caused by this escalation is abhorrent, and I implore the sides to reduce the suffering of civilians,” ICRC Regional Director Fabrizio Carboni said.

The United Nations Palestinian refugee Agency (UNRWA) said it had relocated its central operations center and international staff to Gaza’s south.

Seeking to build support for its response, Israel’s government showed U.S. Secretary of State Antony Blinken and NATO defense ministers graphic images of children and civilians they said Hamas had killed in a weekend rampage in Israel.

Blinken said they showed a baby “riddled with bullets,” soldiers beheaded and young people burned in their cars.

“It’s simply depravity in the worst imaginable way,” he said. “It’s really beyond anything that we can comprehend.”

Like others across the globe, Blinken urged Israel to show restraint, but he also reiterated America’s support, saying, “We will always be there by your side.”

On Friday he was due to meet Jordan’s King Abdullah and Mahmoud Abbas, head of the Palestinian Authority in the Israeli-occupied West Bank, as part of a Middle East tour aimed at stopping spillover from the war.

Blinken also planned to visit key U.S. allies Qatar, Saudi Arabia, Egypt and the United Arab Emirates — some with influence on Hamas, an Islamist group backed by Iran.

Israel’s military chief, Lieutenant General Herzi Halevi, said lessons would be drawn from the security failures around Gaza that enabled the attack.

“We will learn, investigate, but now is the time for war,” he said.

The U.S. military is placing no conditions on its security assistance to Israel, U.S. Defense Secretary Lloyd Austin said, adding Washington expected Israel’s military to “do the right things” in prosecuting its war against Hamas.

Austin was due in Israel on Friday and planned to meet Israeli Prime Minister Benjamin Netanyahu.

Hamas called on Palestinians to rise up on Friday in protest at Israel’s bombardment of the enclave, urging Palestinians to march to East Jerusalem’s Al-Aqsa Mosque and clash with Israeli troops in the occupied West Bank.

Israel’s parliament approved Netanyahu’s emergency unity government late on Thursday, including a number of centrist opposition lawmakers, to display the country’s united determination to fight Hamas.

 On Thursday, Human Rights Watch accused Israel of using white phosphorus munitions in its military operations in Gaza and Lebanon, saying the use of such weapons puts civilians at risk of serious and long-term injury.

Israel’s military said it was “currently not aware of the use of weapons containing white phosphorus in Gaza.”

On Friday, North Korea denied its weapons were used by Hamas in the attack against Israel, saying the claim made in some media reports was a bid by Washington to divert the blame for the conflict from itself to a third country.

The U.S. State Department will begin offering charter flights to Europe to help Americans leave Israel if they want starting Friday, the White House said.

Japan has arranged for a charter flight to depart Tel Aviv on Saturday for its citizens wishing to leave Israel, Chief Cabinet Secretary Hirokazu Matsuno told reporters on Friday.

U.S. law enforcement officials in New York and Los Angeles said they had a stepped up police presence for Friday, especially around synagogues and Jewish community centers, but some officials sought to play down the threat.

The Arab American Anti-Discrimination Committee, an Arab advocacy group, said on Thursday that FBI agents had visited mosques in different states and individual U.S. residents with Palestinian roots, calling it a “troubling trend.”

Gazans, mainly descendants of refugees who fled or were expelled from homes in Israel at its founding in 1948, have suffered economic collapse and repeated Israeli bombardment under a blockade for 16 years.

Palestinian anger has mounted in recent months, with Israel carrying out the deadliest crackdown for years in the West Bank and its right-wing government talking of seizing more land. A peace process meant to create a Palestinian state collapsed a decade ago, which Palestinian leaders say left the population with no hope, strengthening extremists.