GAZA CITY (AFP) - A defiant Israel pounded Gaza with bombs and shells Friday, vowing to pursue its war on Hamas despite a truce order from the UN Security Council, amid warnings the population was running out of food. Israeli Prime Minister Ehud Olmert said Israel would not bow to "outside influence" as its aircraft carried out more bombings and the army's tanks shelled several locations despite an announced three-hour "humanitarian" lull. Hamas meanwhile also rejected the United Nations resolution which called for an immediate ceasefire on the grounds that it only served Israel's interests. Two weeks on from the start of Operation Cast Lead, nearly 800 Palestinians have been killed by Israeli forces, according to Gaza medics. Two Palestinian journalists were lightly wounded when an Israeli missile struck a building in the city housing several media offices, according to reporters and medics. The United Nations on Friday cited witnesses saying Israeli forces moved about 110 Palestinians into a house, told them to stay inside, and later shelled it repeatedly, killing about 30 people. The Israeli army said it had no knowledge of such an incident but was investigating. The UN report said that "according to several testimonies, on January 4 Israeli foot soldiers evacuated approximately 110 Palestinians into a single-residence house in Zeitun (half of whom were children) warning them to stay indoors. Twenty-four hours later, Israeli forces shelled the home repeatedly, killing approximately 30." The UN Office for the Coordination of Humanitarian Affairs (OCHA) called the events in the Gaza City neighbourhood "one of the gravest incidents since the beginning of operations" by Israeli forces in Gaza on December 27. The journalists had been filming the fighting in and around central Gaza City from the rooftop of an eight-storey building housing the offices of several news outlets, including the studios of two Iranian television channels. Pressure on the two sides increased with an Thursday night Security Council resolution which demanded an "immediate, durable" ceasefire leading to the "full withdrawal" of Israeli forces from Gaza. The moderate Palestinian president Mahmud Abbas, whose power is limited to the West Bank, called the UN move an "important step", but said applying it was key. Israel however dismissed the resolution, saying it could not agree to it in the face of continuing rocket attacks. "Israel has never agreed for any outside influence to decide on its right to defend its citizens," Olmert said in a statement. "The IDF (Israel Defence Forces) will continue to operate in order to defend the citizens of Israel and will carry out the task it was given for the operation." The Israeli security cabinet later backed his stance, deciding to continue the offensive. A senior Hamas official told AFP in an interview that the movement will not accept any ceasefire with Israel that does not end the blockade of Gaza. Mussa Abu Marzuk, the Damascus-based deputy head of the powerful Hamas politburo, also said that Israel must end its two-week long onslaught on the Gaza Strip and withdraw its troops from the Hamas-ruled territory. Earlier, another Hamas official in Beirut, Raafat Morra, said his group was also rejecting the UN resolution, as "it is not in the best interest of the Palestinian people." Since early on Friday, Israel staged around 100 strikes on Gaza, which Gaza medics said had killed some 25 people, nearly half of them civilians. The army had arrested some 300 Palestinians in the north of the strip, witnesses said. Hamas and its allies fired more than 30 rockets into southern Israel, injuring one person, the military said. At least four Grad rockets hit Beersheva, about 40km from Gaza. At least 800 people have been killed in the Gaza Strip since Israel launched a massive military assault on the territory two weeks ago, the head of Gaza's emergency services said on Friday. Dr Muawiya Hassanein said at least 800 people have been killed since Israel began bombarding the impoverished Hamas-ruled coastal strip on December 27, and that another 3,330 people had been wounded in the fighting. At least 10 Israeli soldiers and three civilians have been killed either in battle or by rockets and mortars fired from Gaza since the start of the offensive, which is aimed at halting rocket attacks on southern Israel. Egyptian President Hosni Mubarak, who has proposed a three-point plan for a ceasefire that has been backed by Washington, was due to hold talks with Abbas on Saturday (today). Hamas will send a delegation, including representatives from Gaza, to Cairo on Saturday to discuss an Egyptian proposal for a ceasefire, a senior Hamas official told AFP on Friday. Mussa Abu Marzuk, the deputy head of the Islamist movement, said the delegation will ask for clarifications of the three-point plan President Hosni Mubarak announced on Tuesday.