US Government tightens lid on dolphin death probe

http://www.reuters.com/article/2011/03/25/us-dolphins-gulf-idUSTRE72O3JO20110325

By Leigh Coleman
BILOXI, Mississippi

(Reuters) - The U.S. government is keeping a tight lid on its probe into scores of unexplained dolphin deaths along the Gulf Coast, possibly connected to last year's BP oil spill, causing tension with some independent marine scientists.
Wildlife biologists contracted by the National Marine Fisheries Service to document spikes in dolphin mortality and to collect specimens and tissue samples for the agency were quietly ordered late last month to keep their findings confidential.

The gag order was contained in an agency letter informing outside scientists that its review of the dolphin die-off, classified as an "unusual mortality event (UME)," had been folded into a federal criminal investigation launched last summer into the oil spill.
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