The ambulance left its usual home base at Nasser Hospital in Khan Younis six days ago with as many bandages, syringes and other basics as its crew could find, and has been operating as a mobile clinic ever since as there is no way back. The hospital, the largest still functioning in southern Gaza, is in an area of the city where intense fighting is taking place between Israeli forces and Hamas militants, making it too dangerous for patients or even ambulances to pass. "We now function as an ambulance field point in central Khan Younis," said paramedic Nassim Hassan, who heads the emergency unit at Nasser Hospital.