BP and its partners made a series of cost-cutting decisions that ultimately contributed to an oil spill that ravaged the Gulf of Mexico coast over the summer, the White House oil spill commission said on Wednesday.

In its final report on the causes of the largest offshore oil spill in U.S. history, the commission said BP and its collaborators on the doomed Macondo well had lacked a system to ensure their actions were safe.

Whether purposeful or not, many of the decisions that BP, Halliburton, and Transocean made that increased the risk of the Macondo blowout clearly saved those companies significant time (and money), the report said.

(Reporting by Ayesha Rascoe; Editing by Dale Hudson)