The Manhattan district attorney’s office is investigating an accusation that Greg Kelly, a local television anchor who is a son of Police Commissioner Raymond W. Kelly, raped a young woman in Lower Manhattan last October, law enforcement officials and Greg Kelly’s lawyer said Wednesday.

Police detectives initially interviewed the woman late Tuesday night or early Wednesday morning, one of the law enforcement officials said.

But because of the conflict presented by the Police Department’s investigating a sexual assault accusation against the commissioner’s son, the case was handed over on Wednesday to the office of the Manhattan district attorney, Cyrus R. Vance Jr.

Mr. Kelly, 43, denied the accusation in a statement by his lawyer, Andrew M. Lankler, that was released Wednesday evening.