President Joe Biden will address the breakthrough agreement later on Thursday, officials said.

Israel and Hamas agreed to a ceasefire deal to pause the devastating war in the Gaza Strip, multiple officials announced Wednesday, raising the possibility of winding down the deadliest and most destructive fighting between the bitter enemies.

Three officials from the U.S. and one from Hamas confirmed that a deal had been reached, while the office of Israeli Prime Minister Benjamin Netanyahu said final details were still being ironed out.

Netanyahu’s office said in a statement that it hoped “details will be finalized tonight.” Any agreement needs to be approved by Netanyahu’s Cabinet.

Once official, the deal is expected to deliver an initial six-week halt to fighting that is to be accompanied by the opening of negotiations on ending the war altogether.

Over six weeks, 33 of the nearly 100 hostages are to be reunited with their loved ones after months in in captivity with no contact with the outside world, though it’s unclear if all are alive.

Many longer-term questions about postwar Gaza remain, including who will rule the territory or oversee the daunting task of reconstruction after a brutal conflict that has destabilized the broader Middle East and sparked worldwide protests.

Hamas triggered the war with its Oct. 7, 2023, cross-border attack, which killed some 1,200 Israelis and took 250 others hostage. Israel responded with a fierce offensive that has killed over 46,000 Palestinians, according to local health officials, displaced an estimated 90% of Gaza’s population and sparked a humanitarian crisis.

More than 100 hostages were freed from Gaza in a weeklong truce in November 2023.