It seems the FBI is taking the investigation of Hillary Clinton's emails more seriously than some have anticipated.

Fox News' Catherine Herridge reports:

The FBI has expanded its probe of Hillary Clinton's emails, with agents exploring whether multiple statements violate a federal false statements statute, according to intelligence sources familiar with the ongoing case.

Fox News is told agents are looking at U.S. Code 18, Section 1001, which pertains to "materially false" statements given either in writing, orally or through a third party. Violations also include pressuring a third party to conspire in a cover-up. Each felony violation is subject to five years in prison.

This means that the FBI is now investigating whether or not Clinton might have made false statements to investigators, but not necessarily while under oath.

An intelligence source also told Fox News that, "the agents involved are under a lot of pressure and are busting a**."

The latest news comes after Politico reported just this week that the FBI has stepped up its interviews of individuals associated with Clinton and her home-brew email server. The expansion of the FBI's efforts prompted Tom Fuentes, the former Assistant Director of the FBI, to say, "this sounds to me like it’s more than a preliminary inquiry; it sounds like a full-blown investigation."