Gaza's civil defense agency said Israeli strikes overnight and early Sunday killed at least 28 Palestinians, including at one family's home and at a school building.
Human rights group Amnesty International condemned Lebanese militant group Hezbollah for firing salvos of unguided rockets at civilian areas of Israel.
The US said it conducted strikes on Houthi targets in the rebel-held capital Sanaa the same day that a Houthi missile struck Israel's commercial hub Tel Aviv.