New Castle County police have found a possible clue into the whereabouts of a missing elderly couple from Stanton, Delaware.

Their credit card was used to buy gas about 7 p.m. Tuesday in Fredericksburg, Virginia.

Family members say 80-year-old Walter Janusz and his 82-year-old wife, Grace, both have Alzheimer's disease. They were reported missing Tuesday afternoon.

Police have notified all police agencies along the East Coast to be on the lookout for the couple.

Police say the couple should be driving a bronze Oldsmobile Regency, with Delaware registration 462610. They also disappeared last year and were found only after a minor car accident in northern New Jersey.