A doctor from Topsham is facing child pornography charges following his arrest March 23, and a former Belfast police officer is credited with heading the investigation that led to the man’s arrest.

According to a press release from Maine Department of Public Safety Spokesman Steve McCausland, Dr. David A. York — who, until his arrest, had worked as a physician with Concentra Medical Centers in Augusta and Lewiston — faces five counts of possession of sexually explicit materials of children under the age of 12.

York, 59, was arrested at his home on Congress Circle in Topsham about 5 p.m. March 23 by Special Agent Michael McFadden III of the State Police Computer Crimes Unit, with assistance from Topsham Police. York was taken to the Two Bridges Regional Jail in Wiscasset.

On March 25 McCausland said York had surrendered his medical license to the Maine Department of Professional and Financial Regulation the day after his arrest. He said York had also been fired by his employer.

According to the company’s Web site, Concentra is a national health-care company with more than 300 medical centers in 40 states “that provide occupational medicine, urgent care, physical therapy and wellness services in one location.”

McCausland said York did not work with any one particular age group of patients and was a general practitioner.

In a press release issued March 24, Concentra said it had been fully cooperating with authorities after learning of the investigation into York’s alleged crimes and the charges filed against him. Concentra said York had worked for the company for one year.

“First and foremost our primary concern is to our patients and clients, providing them with quality and trusted medical care in a safe, welcoming, and respectful environment,” the press release from Concentra stated. “We continue to go to great lengths in our hiring processes in order to staff our medical centers with professional and upstanding colleagues.”

The head of the State Police, Col. Patrick Fleming, said in the press release announcing York’s arrest that two computers were seized March 23 by the CCU from York’s house and preliminary examinations showed hundreds of images and videos of child pornography.

McFadden obtained an arrest warrant that afternoon from West Bath District Court. McFadden is one of two new investigators added earlier this year to the CCU. He joined the CCU after having worked 19 years for the Belfast Police Department, most recently as a detective. McCausland said McFadden worked as the lead investigator on this case.

Fleming said in the press release there are no indications that any of the images are of Maine children, but the examination of the two computers continues. The press release stated it appeared most of the images are from file-sharing with other personal computers around the country, also known as a peer-to-peer network.

Fleming said the case came to the attention of the CCU in November and is part of the backlog of cases on which the two new investigators are working. McCausland said the other investigator is Special Agent Frank Stepnick, who formerly worked for the South Portland Police Department.

“They’ve been busy working on the backlog of cases that has built up in recent years,” said McCausland, referring to McFadden and Stepnick. “This particular case had been in the pipeline for about five months, and it had risen to the top of the list within the past few days.”