CAIRO/JERUSALEM, July 27 (Reuters) - At least 30 Palestinians were killed in an Israeli strike on a school in Deir al Balah in central Gaza, Palestinian health officials said, and the Israeli military said it had struck a Hamas command centre.

Earlier on Saturday, Palestinian official media said that at least 14 Palestinians were killed by Israeli attacks since dawn in the southern city of Khan Younis and that their bodies were brought to Nasser Medical Complex.

In Al-Bureij refugee camp, five Palestinians were killed earlier in an Israeli air strike on a house, while four others were killed in another strike on a house in Rafah, near the border with Egypt, medics said.

U.N. and humanitarian officials accuse Israel of using disproportionate force in the war and of failing to ensure civilians have safe places to go, which it denies.