Key NASA officials who oversee the agency said they don't believe the shuttle is safe for launch, according to a Local 6 News report.

E-mails sent to NASA's administrator from the agency's inspector general's office obtained by the Orlando Sentinel said they didn't believe shuttle Discovery should launch without more work to prevent foam insulation from breaking off the external fuel tank.

NASA already had a "no go" for flight from the agency's top safety official and chief engineer. However, NASA managers went ahead and gave the "go for launch" for Saturday.

Meanwhile, NASA declined Thursday to release documents from a critical safety meeting where managers debated whether to go forward with the shuttle launch.

Local 6 News partner Florida Today and The Associated Press asked the agency to release records from the Flight Readiness Review meetings under the Freedom of Information Act. The records outline the safety issues raised during the June 16-17 meetings at Kennedy Space Center.

'The question that we have at this point is that last year, NASA was able to release the documents that were used during their flight readiness review -- which is the meeting where the decision is made to go forward with launch," Florida Today's John Kelly said. "This year they have decided in the face of the same request to deny release of the records."

The newspaper immediately appealed the decision to NASA Administrator Mike Griffin. AP is assessing the situation.

Liftoff is scheduled for 3:49 p.m. Saturday.

Watch Local 6 News for more on this story.