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GAITHERSBURG, Md. (WUSA9) -- Investigators believe the one clue that could help them find a missing NIH scientist is finding his car. Martin John Rogers of Gaithersburg, Md. was last seen in person heading to work on August 21, 2014. Investigators say he didn't show up to work and instead, checked into a Motel 8 about four hours later in Lavale, Maryland, just outside of Cumberland.

That was 12 days ago.

Dozens of volunteers have been scouring the Darnestown and Gaithersburg areas since in search of the NIH scientist, husband and father of three. Tuesday, some volunteers, police and Rogers' wife met again to re-strategize and map out the places they haven't searched yet.

"It's like a nightmare. Every day we wake up and think how could this have happened in the first place and how could it continue that every day we don't know where he is," said Kelley Rogers. She described her husband as a church-going man of routine, adding this is not typical behavior.

Rogers works for NIH in the area of researching neglected parasitic diseases, "…malaria, river blindness," said Kelley Rogers, "the things that just wipe out children in Africa."

John, as his family calls him, was born in Africa. He has a British accent and has been living in Maryland for the past decade or so. Investigators tell WUSA9 he's a white male with blue eyes about 5'8" in height and weighs about 180 pounds. John also has white and gray wavy hair.

Police believe he has little cash on him and could be in physical or mental distress. He was described as "agitated" or "in need of help" in the surveillance video showing Rogers at the Super 8 Motel.

Montgomery County Officer, Jason Huggins, told WUSA9 Rogers could still be attached to 2001 blue Audi, Maryland tags: 1BF6739. If the vehicle is found, they can at least hone down the search area which now encompasses several different states.

Family and friends are desperately asking people to keep an eye out for this vehicle or John.

"There are less blue Audis out there than there are white males with gray hair," said Officer Huggins.

If you spot the vehicle or John, call the Montgomery County Police Department immediately at (301) 279-8000.

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