Announcement expected that 'integrity test' moving forward

New Orleans, Louisiana (CNN) -- The man leading the federal response effort to the Gulf of Mexico oil disaster is expected to announce Wednesday that an "integrity test" on the ruptured oil well will go forward, barring any last-minute objections from government scientists, a BP source told CNN.

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The BP source told CNN the delay was the government's decision, saying BP employees and scientists were comfortable with "preliminary pre-testing" readings, but the government team had some concerns and wasn't ready to go to the next level.

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