Philadelphia police are investigating allegations that the recently resigned head of the Police Advisory Commission struck up an inappropriate sexual relationship with a woman who went to the commission regarding a complaint against police.

A police spokesman declined to provide additional details about the investigation into Kelvyn Anderson, first reported by the website BigTrial.net. Anonymous sources told the website that Anderson and the woman started a sexual relationship when she was appealing a police misconduct case, and that the woman subsequently went to the District Attorney's Office and the police department's Special Victims Unit to report her relationship with Anderson.

"I just don't have any comment," Anderson said. "I can't really talk about it."

Ronda Goldfein, chair of the commission, also declined to comment on the allegations, and Lauren Hitt, spokeswoman for Mayor Kenney, said, "We do not discuss the reason for personnel changes."

The report on BigTrial also said the District Attorney's Office "shut down" the SVU investigation into Anderson, which district attorney's spokesman Cameron Kline denied.

"The office does not go into detail about our charging decisions and we certainly do not 'shut down' investigations," Kline said in a statement.

The police spokesman characterized the investigation into Anderson as ongoing.

Anderson, who had served as executive director since 2013, said last week that he stepped down to pursue opportunities in the private sector.