Jerusalem, June 14 (IANS) Israel released on Sunday an official report on its military campaign against the Gaza Strip last summer, claiming that its massive offensive was lawful, while accusing the Islamic Hamas movement of committing "war crimes and crimes against humanity". The 277-page report was issued in an attempt to forestall the upcoming release of findings by a UN-appointed team that investigated possible war crimes during Israel's 50-day campaign in July and August, which, according to the UN, left 2,220 Palestinians dead, including at least 1,492 civilians. The report, issued by the Israeli foreign ministry, clears Israel of unlawful actions, saying it did all it could do to avoid civilian casualties, Xinhua news agency reported.