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The black, oily substance first appeared on at least six driveways in Harrison Township, Michigan, on Sunday The mystery substance was seen on resident's roofs, cars and porches Michigan Department of Environmental Quality officials collected samples of the substance on Wednesday Residents originally believed that the substance could have come from the nearby Selfridge Air National Guard Base The airbase released a statement saying it was not coming from their area It could be at least a week before the city discovers what the substance is Read more: http://www.dailymail.co.uk/news/article-3452202/Mysterious-tar-like-oily-substance-falls-sky-covers-cars-porches-driveways-Michigan.html#ixzz40aFZpBvn Follow us: @MailOnline on Twitter | DailyMail on Facebook