Wunschdorf/Elster (dpa/th) - A letter with a suspicious substance triggered a police and fire brigade operation in Wunschdorf/Elster (Greiz district). A 55-year-old received the letter on Tuesday afternoon, the police said. According to a spokesman, the man was not injured by the powdery substance. He was examined by a doctor. The substance was said to be non-radioactive. It will now be further investigated. The spokesman said that it was being determined who sent the letter and for what reason.