An Israeli airstrike in northern Gaza killed at least 20 people, mostly women and children, Palestinian officials said Tuesday, as Palestinians fled Israel's assault. Some said they had hardly eaten, with aid cut off for weeks to the most isolated and heavily destroyed part of the territory. Israel has been waging an offensive in Gaza's northernmost end for weeks, saying it is targeting Hamas militants who regrouped in the area. The UN has said Israel hasn't allowed food and other supplies into the area north of Gaza City since the assault began, even as tens of thousands of people remain there. That has drawn rebukes from the Biden administration, which has warned that US laws might force it to curb military aid to Israel if more aid is not allowed in. The strike late Monday hit a home where several displaced families were sheltering in the town of Beit Lahiya, near the border with Israel, according to Hossam Abu Safiya, the director of the recently raided and barely functioning ..