An air ambulance aircraft with six people on board has gone missing over the Atlantic Ocean during a nighttime flight from Bermuda to Boston. The plane disappeared from radar early Saturday morning near Nantucket Island. Just before losing all contact, the aircraft’s pilot reported an emergency situation. A search and rescue operation is currently underway. Authorities are focusing their efforts around the location where the aircraft was last detected. The cause of the emergency remains unknown at this time. Further updates will be provided as the search progresses.