With Israel promising a punishing new offensive, Palestinians in Gaza's largest city are paralyzed with fear. They are unsure where to go, when to leave and if they will ever return. Israel has declared Gaza City to be a combat zone while the military moves forward with plans to overtake it in a campaign to crush Hamas. Parts of the city are already considered “red zones,” where Palestinians have been ordered to evacuate ahead of expected heavy fighting. That has left people there on edge. Departing the city now could mean leaving for good, but staying behind could be deadly.