UNRWA on Instagram: "Yesterday, the Israeli Army stopped a UN convoy on its way to northern #Gaza for more than eight hours despite prior detailed coordination. Staff on the convoy were traveling to roll out the #polio vaccination campaign for children in the north. All staff and convoy are now released and back safely in the UN base. This significant incident is the latest in a series of violations against UN staff. UN staff must be allowed to undertake their duties in safety and be protected at all times in accordance with international humanitarian law. Gaza is no different."