Supplies have been turned back at checkpoints and stuck in neighbouring countries due to Israeli restrictions on entry into Gaza, said aid organisations. Global aid agencies are preparing for one of the largest humanitarian operations in recent history, as a long-awaited ceasefire between Israel and Hamas appears set to take hold.  The truce is expected to offer a fragile lifeline to Gaza’s 2.1 million residents after two years of devastating war.  The United Nations said it is ready to roll