A stranger struck a 74-year-old man in the back of the head during an apparently random attack in Brooklyn, police said Saturday. The assault came as unprovoked attacks in the city, particularly in Manhattan, have increased in recent weeks. The senior was walking near the corner of Ashford St. and Sutter Ave. in East New York about 3:30 p.m. on April 14 when a man in his mid to late 20s ...