Another clue about Nancy Guthrie‘s potential kidnapper is tucked into an email from a man who claims he knows the individual who abducted Nancy … and it sounds like the suspect may have crossed the border.

The latest money demand sent to TMZ ends with this … “for the man hunt of the main individual that can give you all the answers and be prepared to go International.”

It sounds to us like the guy demanding the $100,000 FBI reward implies that Nancy’s kidnapper is hiding out in Mexico.

Nancy was abducted from her home near Tucson, Arizona … and Mexico is a short drive south.

It’s unlikely the kidnappers would have taken Nancy on a commercial jet … that would require ID and the jig would be up. Plus, a previous ransom note sent by the alleged kidnapper themselves indicated Nancy was within a 700-mile radius of Tucson, which further supports the theory this kidnapper may be in Mexico.

Our sources tell us the FBI is hyper focused on the ransom note we received … and they’re also very interested in this latest batch of emails demanding bitcoin in return for information on Nancy’s kidnapper.

The phrase “the main individual” is also significant … it clearly suggest there are accomplices.