Authorities are investigating a white powdery substance that was delivered in greeting cards to three locations in the Merrimack Valley, according to State Fire Marshal Stephen Coan. “Our regional hazmat team for that area of the state has responded to three locations, in Methuen, Lawrence, and Haverhill,” said Coan. “Each one of them has some similarity. Each recipient received a greeting card through the US mail today with a return address in Haverhill that contained an unidentified white powdery substance.”
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