Pentagon unsure how live anthrax went to 51 US labs and three countries

The Pentagon disclosed Wednesday that it inadvertently shipped possibly live anthrax to at least 51 laboratories across the US and in three foreign countries over the past decade, but it has yet to determine how it happened, who is to blame, why it was not discovered earlier and how much worse the embarrassment will get.

One of the few things Pentagon officials said they were sure of is that public health is not at risk.

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