On the evening of Wednesday, November 19, 1986, acting on a tip, an NYPD team of 27 from the 41st Precinct and the Emergency Service Unit, the ESU, converged on the six-story, Fulton Avenue apartment building where two of Davis's sisters had adjoining apartments on the ground floor. At about 8:30 p.m., 15 officers surrounded the building and 12 others entered; nine of these went to the three-room apartment of Davis's sister Regina Lewis and seven entered it. Inside were Davis, his girlfriend, his sister, her husband, and four children. Lewis's two infant children were asleep in the bedroom at the rear.