URGENT - New York Hospital Evacuation

(CNN) -- New York City's Bellevue Hospital will evacuate the remaining 700 patients inside, a source familiar with the evacuation plan told CNN. The hospital's generators are on the 13th floor, but the pumps that supply oil to the generators are in the basement under 8 feet of water, the source said, adding that the evacuation could take up to two days. Many critically ill patients were already evacuated. Ambulances are lined up outside the hospital in preparation, CNN's Dr. Sanjay Gupta reports.