Israeli forces launched a devastating wave of new airstrikes against Hamas in the Gaza Strip early Tuesday as the cease-fire deal fell apart following the terror group’s refusal to free more hostages.

More than 400 people were killed, according to Hamas-controlled Palestinian authorities.

Israel said it was following through on its promise of “strong action” against Hamas for refusing to release the remaining 59 of 250 hostages — 24 of whom are still believed to be alive, including the last American one, New Jersey native Edan Alexander.

“Israel will, from now on, act against Hamas with increasing military strength,” Prime Minister Benjamin Netanyahu’s office vowed in a statement following the strikes that were ordered after talks between the two sides to extend the peace agreement stalled.

“Hamas repeatedly refused to release our hostages and rejected all offers it received from the U.S. presidential envoy, Steve Witkoff, and from the mediators.”

The Israel Defense Forces also said it learned of Hamas’ preparations to launch new attacks on Israel as the terror group stocked up on weapons, according to the Times of Israel.

Tuesday’s surprise wave of airstrikes saw women and children and children killed, according to Palestinian health officials. 

At least four senior officials, including two top cops in the Hamas administration, were also killed in the strikes. 

Israel and Hamas had agreed to a cease-fire in January, which led to about three dozen Israeli hostages being freed in exchange for the release of nearly 2,000 Palestinian prisoners.

The first phase of the delicate truce ended two weeks ago and since then the two sides hadn’t been able to come to terms on the next phase that was supposed to include the release of the 59 remaining hostages in Hamas captivity.

Israel’s Defense Minister Israel Katz warned early Tuesday “the gates of hell will open in Gaza” and Hamas will be struck with a force it has “never seen before” if the remaining hostages aren’t freed, according to the Times of Israel.

Hamas slammed Israel early Tuesday, accusing the Jewish state’s government of an “unprovoked escalation,” as strikes rained down in Gaza in multiple locations. 

“The international community faces a moral test: Either it allows the return of the crimes committed by the occupation army or it enforces a commitment to ending the aggression and war against innocent people in Gaza,” terror organization official Taher Nunu said.

The Hamas-backed Gaza Ministry of Health said at least 69 people were killed so far from the Israeli assault.

Israel leaders have said they won’t stop the fighting unless Hamas, which carried out the Oct. 7, 2023, terror attack, cedes power in Gaza.

Leading up to the new round of strikes, Netanyahu earlier this month cut off the entry of all food and aid deliveries into the territory to apply more pressure on Hamas.

And while bloodshed had largely stopped during the cease-fire, Israel had left some troops in the territory and carried out strikes aimed at specific targets.

The Jewish state has claimed its attacks were in response to Palestinians trying to carry out attacks or encroaching on troops in no-go zones.

Several strikes earlier Monday also killed 10 people in Gaza, local authorities said.

Various United Nations officials have expressed shock over the strikes, including Secretary-General Antonio Guterres, who called for humanitarian aid to resume in Gaza and the hostages to be released unconditionally. 

The Humanitarian Coordinator for the Occupied Palestinian Territory also urged that the cease-fire in Gaza be immediately reinstated. 

“Waves of airstrikes occurred across the Gaza Strip in the early hours of the morning … This is unconscionable,” Muhannad Hadi said in a statement. 

With Post wires