A Dunwoody doctor's office is shut down on Wednesday and the doctor, his medical assistant and two patients are arrested.

Authorities say it's part of an investigation into a possible pill mill at the doctor's office, located at 11 Dunwoody Park, in Atlanta.

Chuvalo J. Trusdale, Special Agent with the Drug Enforcement Agency tells WSB, "We developed information about this illegal prescribing practices of a Dr. Nisar Piracha at the Dunwoody Park Office where officials served a search warrant and arrest warrants on Wednesday."

Agent Trusdale says during the raid, two patients were also arrested.  One of the patients was from Kentucky.

"Every time we go to one of these locations there are patients there to be seen and often time they'll have drug paraphernalia and other things.  And, so from interacting with the patients that led to two additional arrests," says Trusdale.

Others who work in the same business complex (11 Dunwoody Park, Atlanta) say they noticed lots of traffic in and out of the doctor’s office and suspected it might have been a possible pill mill.

Ivone Paris, who works in the Dunwoody Business Park tells Channel 2 Action News, "They were never anything but nice to us, the doctors and the girls, but we were always suspicious that something was going on."

Dr. Piracha's Medical offices will remain shut down indefinitely, says Agent Trusdale.