Suffolk County Police Homicide Squad detectives are investigating the shooting deaths of four people during a robbery at a Medford pharmacy this morning.

Fifth Precinct police officers responded to Haven Pharmacy, located at 76 Southaven Ave., after a 911 caller reported a robbery and that two people had been shot, possibly fatally. When officers arrived, they discovered four victims who were fatally shot. The victims were identified as employees, Raymond Ferguson, 45, of Centereach, and Jennifer Mejia, 17, of East Patchogue, and customers Bryon Sheffield, 71, of Medford, and Jamie Taccetta, 33, of Farmingville.

The suspect, who stole prescription drugs from the store, is described as a white man with a thin build, approximately 5 feet 8 inches tall, who was unshaven or had a dark beard and mustache and short, dark hair. He was wearing a white baseball hat, sunglasses, a dark-colored hooded sweatshirt, blue jeans, dark shoes and was carrying a black backpack. He fled on foot, headed eastbound on Southaven Avenue.

The suspect was armed with a handgun and should be considered armed and extremely dangerous.

Detectives are asking anyone with information to call the Homicide Squad at 631-852-6392 or Crime Stoppers at 1-800-220-TIPS. All calls will be kept confidential.