Israeli airstrikes killed 33 Palestinians, including 13 children, in Gaza early on Sunday, Gaza health officials said, and rockets fired into Israel as hostilities stretched into a seventh day.

The pre-dawn attacks were on houses in the centre of Gaza City, health officials said. A spokesperson for the Israeli military said he would look into these reports.

The death toll in Gaza jumped to 181, including 52 children, since the fighting erupted last Monday. In Israel, 10 people including two children have been...