Humanitarian aid workers were surrounded and threatened during an incident involving a UN convoy and the Israeli army in the Gaza Strip, the United Nations said on Tuesday. “The situation escalated very quickly, with soldiers pointing their weapons directly towards our personnel in the convoy. The UN vehicles were encircled by Israeli forces and shots were fired,” UN spokesman Stéphane Dujarric said in New York about the Monday incident at a checkpoint in central Gaza. “The convoy was then approached by [Israeli] tanks and a bulldozer, which proceeded to ram the UN vehicles from the front and …