MIAMI FL JULY 31: Former First Lady and Secretary Of State Hillary Rodham Clinton speaks during a campaign stop at Florida International University on July 31, 2015 in Miami, Florida. (Photo by Uri Schanker/WireImage)

 Photo courtesy of WireImage.com

August 5, 2015 | 7:26pm

The FBI investigation into former Secretary of State Hillary Rodham Clinton’s unsecured email account is not just a fact-finding venture — it’s a criminal probe, sources told The Post on Wednesday.

The feds are investigating to what extent Clinton relied on her home server and other private devices to send and store classified documents, according to a federal source with knowledge of the inquiry.

“It’s definitely a criminal probe,” said the source. “I’m not sure why they’re not calling it a criminal probe.

“The DOJ [Department of Justice] and FBI can conduct civil investigations in very limited circumstances,” but that’s not what this is, the source stressed. “In this case, a security violation would lead to criminal charges. Maybe DOJ is trying to protect her campaign.”

Clinton’s camp has downplayed the inquiry as civil and fact-finding in nature. Clinton herself has said she is “confident” that she never knowingly sent or received anything that was classified.

The inspector general for the intelligence community has told Congress that of 40 Clinton emails randomly reviewed as a sample of her correspondence as secretary of state, four contained classified information.

To read expanded article, click here.