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The United Nations has warned that Israel's military incursion into Rafah and the closure of border crossings pose a major obstacle to aid operations in the Gaza Strip, with disastrous implications for its population.No aid trucks have entered Gaza since Sunday, the United Nations said Wednesday, while Israel sent tanks and troops to Rafah and blocked the two southern crossings where most of the aid entered, Rafah on the Egyptian border and near Kerem Shalom on the Israeli border. . Israel said the Kerem Shalom crossing reopened on Wednesday, but did not say when the Rafah crossing would reopen. The…