DANVILLE — Vermont State Police say they have received reports of a suspicious couple visiting residences in the Danville and Walden areas, but the couple could be simply conducting a survey.

State police say they received a complaint Saturday about a black man, approximately 6 feet 3 inches tall, 200 pounds, 30 to 50 years old, and a white woman with dark brown hair who arrived at a residence, asked questions and left in a silver-colored vehicle with out-of-state plates.

Another complaint Sunday described the same couple leaving pamphlets about the New England Homecare Union and United Healthcare Workers East-Vermont.

State police say several out-of-state companies have been conducting surveys in Vermont recently and it’s believed that is what the couple was doing. State police are still trying to identify the couple, however, and verify their business.

State police advise residents to ask for identification from any strangers who arrive at their homes.