October 28, 2010 3:36 PM

Report: Halliburton knew BP well's cement likely unstable

Houston-based Halliburton knew that the cement it was using to seal BP's Deepwater Horizon oil well was unstable, but did not tell BP or act on the information internally before the well blew up April 20, the staff of the presidential commission investigating the disaster reported Thursday. The findings add to the growing body of evidence that safety procedures intended to head off such accidents were ignored or overlooked.

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