The Israeli military has called on Palestinians to evacuate northern Gaza, where it has been waging a large offensive for more than three weeks. The official said the operation in the northern Gaza city of Jabaliya would last ”several more weeks.”

The U.N. said earlier this month at least 400,000 people are in northern Gaza, an area that was an early target of Israel’s retaliatory war. Hunger there is rampant as the amount of humanitarian aid reaching the north has plummeted over the past month.

The Israel-Hamas war began after militants from Hamas and other groups stormed into Israel, killing some 1,200 people — mostly civilians — and abducting 250 others. The war has roiled the Middle East, setting off fighting between Israel and Hezbollah as well as between Israel and Iran, archenemies who had long kept their conflict a shadow war but are now engaging in open fighting.

International mediators renew efforts for a Gaza cease-fire

After collapsing in late summer, international mediators were trying to jump-start cease-fire efforts between Israel and Hamas. Israel said it would continue discussions on a halt in fighting after the head of the Mossad agency, David Barnea, returned from a meeting in Qatar with the head of the CIA, David Burns, and the Qatari prime minister.

Egyptian President Abdel Fattah el-Sissi has suggested a two-day cease-fire in exchange for the release of four hostages. Israel appeared responsive to the idea.