Israeli tanks moved deeper into Gaza City's residential districts on Sunday, as local health authorities said they have been unable to respond to dozens of desperate calls, expressing concern about the fate of residents in the targeted areas. Witnesses and medics said Israeli tanks had deepened their incursions in the Sabra, Tel Al-Hawa, Sheikh Radwan and Al-Naser neighbourhoods, closing in on the heart and the western areas of Gaza City, where hundreds of thousands of people are sheltering. The Israeli military launched its long-threatened ground offensive on Gaza City on Sept 16 after weeks of intensifying strikes on the urban centre, forcing hundreds of Palestinians to flee although many still remain. Hamas, which Israel has demanded must surrender, said on...