Israel bombarded Gaza with airstrikes on Tuesday after a brief overnight lull during which the U.N. sent a small fuel convoy into the enclave, where it says 52,000 people are now displaced.
Israeli leaders said they were pressing on with an offensive to destroy the capabilities of Hamas amid calls by the United States and other world powers for an end to the conflict.
Gaza residents said Israel was keeping up intense airstrikes. Witnesses said an Israeli tank shell hit a paint factory in the southern Gaza Strip, setting it on fire.
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Hamas began firing rockets eight days ago in retaliation for what it said were Israeli rights abuses against Palestinians in Jerusalem during the holy month of Ramadan.
Gaza medical officials say 215 Palestinians have been killed, including 61 children and 36 women, and more than 1,400 wounded.
Nearly 450 buildings in the Gaza strip have been destroyed or badly damaged, including six hospitals and nine primary care health centres, the United Nations humanitarian agency said. Some 47,000 of the 52,000 displaced had fled to U.N. schools.
Egypt and U.N. mediators also stepped up diplomatic efforts, and the U.N. General Assembly will discuss the violence on Thursday.
Germany called for a ceasefire and offered more aid to help Palestinians before emergency European Union talks.
