Israeli airstrikes killed at least 21 people in Gaza, local medics said and fighting ramped up, as the Israeli military said it had been targeting command centres used by Hamas, reports. Palestinian health officials said at least 13 people, including women and children, were killed in two Israeli strikes on two houses in Nuseirat, one of the enclave’s eight historic refugee camps. There has been no immediate comment by the Israeli army on the two strikes. Another strike on a school sheltering displaced Palestinian families in the Tuffah neighbourhood of Gaza City killed at least seven people, medics added.