A long-delayed federal investigative report into a Gulf well blowout two years ago blames the drilling rig's crew for not using a dense enough fluid to control natural gas in the well and for reacting too slowly when the blowout started.

The government report, released last week, looked at the root causes for the blowout of a Walter Oil & Gas well off the central Louisiana coast on July 23, 2013. The rig, provided by Hercules Offshore, burned for 72 hours and was destroyed at a cost of nearly $60 million, according to Bureau of Safety and Environmental Enforcement regional director Lars Herbst.

Authorities say 44 workers evacuated the rig without injury. There were no injuries or fires reported.

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