A U.S. official said BP (NYSE:BP) aims to retrieve a failed blowout preventer from its ruptured Macondo well in the Gulf of Mexico on Tuesday or Wednesday, according to a Reuters report published Friday.

The blowout’s failure set off the spill and will be critical evidence in criminal and civil investigations into the cause of the April 20 explosion on the Deepwater Horizon drilling rig that killed 11 men and sent millions of gallons of oil spewing into the Gulf.

The oil company has tried to remove pieces of a drill pipe inside the blowout preventer for weeks, though after failing this week the company decided to move forward on recovering the blowout preventer with or without the pipe remnants stuck inside, said retired Coast Guard Admiral Thad Allen at a briefing in Washington, Reuters reported.

Federal investigators are reportedly on site to ensure the equipment is properly preserved.

Upon the blowout preventer’s retrieval, BP will replace it with another and then resume drilling a relief well that is planned to intercept the Macondo well near its bottom.

The interception, which is expected to allow the company to completely stop the flow of oil and gas from the well, is targeted for Sept. 6, according to the report.

BP temporarily stopped the flow of oil on July 15 using a cap.