NEW ORLEANS (AP) — An internal BP probe of the 2010 oil spill in the Gulf of Mexico didn't explore whether upper-level management had a role in causing the disaster because investigators didn't have access to its partners' employees and records, a BP executive testified Thursday at a trial designed to assign blame to the companies.

Mark Bly, who led the investigation and has served as BP's global head of safety, said his team didn't have enough information to conduct a "systemic evaluation" of what caused the blowout of BP's Macondo well without cooperation from rig owner Transocean Ltd. or other companies that worked on the project.

A report by Bly's team in September 2010 focused on mistakes that rig workers made before the blowout triggered an explosion that killed 11 workers and led to the nation's worst offshore oil spill.

A BP policy says accident investigations should include attempts to identify any "systemic failures within the management system." Bly, however, said he and then-BP chief executive Tony Hayward departed from policy and decided at the outset not to attempt a broader probe.

"We could have attempted to do it, but we felt that we had good results from what we had gotten and didn't make the choice to go beyond," Bly said in response to questions by a lawyer for Gulf Coast residents and businesses that have sued BP.

In what has become known as the "Bly Report," BP took some responsibility for the web of errors and failures that led to the disaster but also assigned plenty of blame to its partners. In earlier testimony, Bly said the investigation wasn't intended to look at the disaster through the "lens of responsibility."

While questioning Bly on Wednesday, plaintiffs' attorney Paul Sterbcow read aloud from the report and asked him about its eight "key findings." One of those said BP rig supervisors and Transocean crew members botched a crucial safety test that should have showed them a blowout was brewing.

"It was an important test and it was misinterpreted," Bly said.

Robert Kaluza and Donald Vidrine, the BP well site leaders accused of misinterpreting those test results, have been indicted on manslaughter charges and await a separate trial.

Attorneys for the U.S. government and lawyers for Gulf Coast residents and businesses have accused BP of putting profits ahead of safety on a project that was over budget and behind schedule. BP has said drilling in the Gulf is a team effort and its partners should share in the responsibility for the disaster. The trial is designed to assess the fault of each company involved, and billions of dollars are at stake.

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