The federal investigation into Fox News is widening with two agencies now looking into the network's practices.

A person familiar with the investigation has confirmed to CBS News that investigators from the U.S. Postal Inspection Service are involved in the Justice Department probe into Fox News. That investigation is reportedly looking into money matters at the network, reports CBS News correspondent Jericka Duncan.

While the existence of the Justice Department investigation came to light two months ago, the Postal Inspection Service's involvement is new.

Meanwhile, the network has been lashed by a series of conduct-related lawsuits.

Eleven current and former employees filed a class action suit last month, claiming executives fostered a "culture of severe racial harassment" and ignored their complaints going back years.

Fox News denied those claims, promising to "vigorously defend these cases."

This was the first week in 20 years that Bill O'Reilly was not employed by the network. He was pushed out after more than 50 companies pulled ads over allegations of sexual harassment by several women.

O'Reilly's departure came nine months after former Fox News chairman Roger Ailes was forced out over similar claims.

Both O'Reilly and Ailes have repeatedly denied the allegations against them.

CBS News reached out to Fox News for comment on the expanding federal investigation and did not hear back.