A witness says she watched cars being swept by flash flooding through a downtown street in Ellicott City, Maryland. Jessica Ur, a server at a cafe on the city's Main Street, told The Baltimore Sun she saw the gushing brown waters carry three or four parked cars down the street. The newspaper reports that the swirling waters reached the second floor of one building at its height. Maryland Governor Larry Hogan earlier declared a state of emergency in the flood-stricken area. Hogan says he has directed the Maryland Emergency Management Agency to assist Ellicott city to recover.