4 Shot Dead in Long Island Pharmacy Robbery Police don't know why robbery turned into massacre By Mark Russell, Newser Staff Posted Jun 20, 2011 3:21 AM CDT 7 comments Comments Homicide investigators talk in front of Haven Drugs in Medford, NY, yesterday. (AP Photo/David Rubin) (Newser) – A robbery gone wrong ended with four people shot to death in a small Long Island pharmacy yesterday morning, reports AP. Police don't know why the robber killed the two employees and two customers at the family-owned shop in Medford, and have no suspects in custody. One of the victims was a 17-year-old high school student who worked there part-time. "I don't know what happened," said her father. "She was supposed to graduate Thursday." The pharmacy, Haven Drugs, had opened for business at 10am; the massacre happened at 10:20. Investigators believe a single gunman was responsible for the bloodbath, and that the motive was robbery. The suspect was reportedly armed with a handgun and stole prescription drugs from the pharmacy before fleeing with a black backpack.