International mediators were set to hold a new round of talks Thursday aimed at halting the Israel-Hamas war and securing the release of scores of hostages, with a potential deal seen as the best hope of heading off an even larger regional conflict.

The US, Qatar and Egypt were to meet with an Israeli delegation in Qatar as the Palestinian death toll from the 10-month-old war nears 40,000. Hamas has not said whether it will participate, accusing Israel of adding new demands to an evolving proposal that had US and international support.