Israeli military said the evacuation order was for the personal safety of the civilians. They said their forces will begin operations there in the coming days since Hamas operatives are hiding in the city's underground tunnels. Hamas has rejected the evacuate order. The United Nations, which has already moved its operation to the south, has warned of "devastating" outcome if over a million residents of Gaza City had to undertake such a large-scale movement. "Residents of Gaza, move south for your personal safety and your families. Distance yourself from the Hamas terrorists who use you as human shield. IDF will continue to operate significantly in Gaza City in the coming days, and wishes to avoid harming civilians," the Israeli Defence Force said.