Barnard, Vermont - Former FBI director Louis Freeh was seriously injured in a car accident while driving through rural Vermont on Monday, police said.

Freeh, 64, was found in his car by Vermont State Troopers at about 12:16 p.m. in Barnard. Officials say he was driving along Vermont Route 12 when his car, a GMC Yukon, ran off the road, hitting a mailbox, a group of shrubs and finally coming to rest near a tree.

He was wearing his seat belt at the time of the crash. Freeh was transported by helicopter to Dartmouth Hitchcock Medical Center in New Hampshire to receive treatment.

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The cause of the accident is being investigated. Freeh's current condition is unknown, Vermont State Police officials told CBS News. Nobody else was injured in the accident.

Freeh served as FBI director from 1993 to 2001. Since leaving the agency, he worked privately as an attorney, most notably conducting the internal investigation for Penn State in the Jerry Sandusky sexual abuse case.