reporter: ahmed says his family had been taking shelter in a school in khan younis when an air strike hit. it took hours, he says, to reach the nearest hospital, still able to treat little ataf. it was too late. across gaza more than 10,000 children have been killed since the garn, according to the hamas-run health men industry. many -- ministry. many more left orphaned or facing life-changing injuries. in the central city, the air strikes are daily. those who survive left to dig through the rubble with their bare hands in search of their loved ones. meanwhile in rafah, once deemed a safe zone, unicef estimates that there are more than 600,000 children among the over a million people in the area, many taking shelter in these sprawling tent cities. the southern city has for weeks come under relentless air strikes by the israeli military who say they are targeting hamas. but now a looming ground operation is stoking fears that rafah could become, as one aid group described it, a zone of bloodshed. "if by some misfortune there's an invasion of rafah, two-thirds of the population will die," he says. "we can't get out of rafah. we have fwno other alternative." israel says it is c