Israel's military closed all Gaza border crossings on Saturday after announcing air strikes on Iran. The closures have raised concerns about a return to famine, which occurred during a previous two-year Israeli offensive. United Nations official Karuna Herrmann estimates that fuel supplies could last three or four days, while Palestinian aid leader Amjad Al-Shawa estimates that shortages could also occur if the crossings remain closed. The closure is part of a broader U.S.-backed plan to end the war, which involves reopening the Rafah border crossing with Egypt and increasing the flow of aid into the enclave.