An Israeli air strike killed four Palestinians in Gaza, the territory's civil emergency service said, as Arab mediators and the United States tried to hammer out differences between Hamas and Israel over a January 19 ceasefire agreement.

Israeli fire has killed eight Palestinians in the Gaza Strip and three more in the occupied West Bank over the past 24 hours, Palestinian officials said Tuesday, even as a fragile ceasefire with Hamas in Gaza has largely held since late January.

Israel's state power company cut electricity to a Gaza water treatment plant, sparking warnings of a dire health crisis in a population in desperate need of food, medicine, and aid. Zachary Goelman produced this report.