US attorney conducting criminal investigation into Fox News

The Manhattan U.S. Attorney's Office is conducting a criminal investigation into Fox News, an attorney involved and other sources familiar with the matter told ABC News.

Judd Burstein, an attorney representing former Fox News personality Andrea Tantaros, said during a hearing today that one of his clients received a subpoena to testify before a federal grand jury investigating the use of corporate resources in connection with sexual harassment allegations against former Fox News CEO Roger Ailes and Fox News parent company 21st Century Fox.

Burstein said the subpoena didn't involve Tantaros but a different client, whom he did not name.

A spokeswoman for U.S. Attorney Preet Bharara declined to comment.

Fox News responded, saying in a statement, "Neither Fox News nor 21st Century Fox has received a subpoena, but we have been in communication with the U.S. Attorney's Office for months - we have and will continue to cooperate on all inquiries with interested authorities."