The statement asserted that the article “might be a criminal product of criminal minds,” and said NXIVM “will explore any and all legal remedies.”

“NXIVM was not able to participate in this story because it painfully held true to the due process of our free world justice system,” the statement said.

During a three-month period, officials of Nxivm did not respond to repeated requests by The Times for interviews and responses. Neither Dr. Porter nor Dr. Roberts responded to repeated inquiries.

Mr. Azzopardi said in his statement: “The allegations in this article are disturbing. Counsel’s Office will be reviewing this matter to determine if applicable laws, regulations and procedures were followed by the agencies cited in this report and that review will determine if further action is warranted.”

In a letter, the State Department of Health declined to take action on a complaint filed in July against Dr. Roberts because she had not been acting as a doctor treating a patient when she reportedly performed branding.

In a separate complaint filed in August, a former member of Nxivm, Jennifer Kobelt, 28, described Dr. Porter as the physician who treated Mr. Raniere’s followers when they got ill and the “main scientist” who conducted tests involving the group.

Last year, Ms. Kobelt said, Dr. Porter drove her to a former restaurant called Apropos in Clifton Park, N.Y., a town not far from Albany that is now used by Nxivm as a meeting center.