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The FBI and the Centers for Disease Control and Prevention are investigating “questionable vials” labeled “smallpox” and found in a freezer last night at a Merck facility outside Philadelphia, according to an alert sent to Department of Homeland Security leadership on Tuesday night. There were reportedly a total of 15 questionable vials, according to the unclassified “For Official Use Only” alert, a copy of which was obtained by Yahoo News. Five of the vials were labeled as “smallpox” and 10 were labeled as “vaccinia.”

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