Halliburton (HAL -11.7%) knew the cement it recommended to seal BP's (BP +1.6%) Macondo well had...

|About: BP p.l.c. (BP)|By:, SA News Editor

Halliburton (HAL -11.7%) knew the cement it recommended to seal BP's (BP +1.6%) Macondo well had been found unstable in tests, possibly contributing to the Gulf blowout, a presidential commission states. The data bolsters BP's claims that faulty cement contributed to the Gulf oil spill but doesn't shed light on its awareness of the problem.