In general, reactions among community members are little different from reactions of other populations affected by a major tragedy, said Louis Belzie, M.D., M.P.H., health and palliative care at Brookdale University Hospital and Medical Center. These included depression and anxiety, as well as posttraumatic stress disorder, substance abuse, major depression, and panic disorder in the longer term. Most vulnerable to these symptoms were women, children, the elderly, and people who had a preexisting physical injury or preexisting mental illness.