SpaceX's ambitious plan to fuel its rockets with astronauts aboard has raised concerns among the experts. A group of space industry authorities responsible for advising NASA has forwarded some reservations about the procedure to the agency.

The concerns about the process were further elevated following the explosion of SpaceX's unmanned rocket on September 1.

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The Space Station Advisory Committee held a conference call this Monday and stated that SpaceX procedure is a "hazardous operation." The committee chairman Thomas Stafford added that the September 1 explosion heightened the committee's concern. A SpaceX rocket exploded during fueling earlier this year. The investigation is still under process to determine the causes of the blowout.

The advisory committee offered various recommendations to the space agency on a multitude of issues ranging from flight safety to crew health. While the recommendations offered by the agency are not binding, they may impact SpaceX's timeline for its manned space mission.

SpaceX stated that the company is ready to re-evaluate its fueling system, depending on the findings of the investigation. The space company also stated that it might reexamine its launch processes as well. The company requires NASA approval for its launch systems to take astronauts into space.

NASA, on the other hand, stated that it is carrying out an evaluation of SpaceX's fueling procedures. The agency will incorporate the results of investigations into its evaluation. Last week, SpaceX had said that it believes a fueling system issue was the cause of the explosion. The company has narrowed down the causes to one of three overwrapped pressure vessels.