Humanitarian workers already face a slew of challenges getting aid to civilians in the besieged Gaza Strip, and fear that as the war on Gaza rages on they may be forced to halt operations. Aid groups say the humanitarian crisis in the war-ravaged Palestinian territory, where the UN has warned of looming famine, has significantly deteriorated since Israeli troops entered eastern Rafah last week. The Israeli military has launched what it called a “limited” operation, seizing on May 7 the Rafah crossing on the Egyptian border — a key aid conduit that is now shut — and sparking an exodus of Pale…