Israeli forces bombarded the Gaza Strip’s historic refugee camps in the centre of the enclave and struck Gaza City in the north on Thursday, killing at least 21 people, and tanks pushed deeper into Rafah in the south, health officials and residents said.

A barrage of Israeli airstrikes killed 16 in Zawayda town, Bureij and Nuseirat camps and the overcrowded city of Deir-Al-Balah, the last major urban centre in Gaza not to be invaded by Israeli forces, health officials said.