New York Police officers stand watch at an entrance to Rockefeller Center along Fifth Avenue where the Rockefeller Center Christmas tree could be seen after the lighting ceremony, Wednesday, Dec. 2, 2015, in New York. Increased security surrounded the annual event, which drew several thousand spectators. (AP Photo/Julie Jacobson)

New York Police officers stand watch at an entrance to Rockefeller Center along Fifth Avenue where the Rockefeller Center Christmas tree could be seen after the lighting ceremony, Wednesday, Dec. 2, 2015, in New York. Increased security surrounded the annual event, which drew several thousand spectators. (AP Photo/Julie Jacobson)