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Kuala Lumpur, Malaysia (CNN) -- Raw satellite data about missing Malaysia Airlines Flight 370 will be released Tuesday, a Malaysian official said Monday.

Malaysian acting Transport Minister Hishammuddin Hussein made the comments about the data from satellite company Inmarsat as he toured a newly constructed terminal at Kuala Lumpur International Airport.

Families of the passengers on board the plane, which disappeared in March over Southeast Asia while carrying 239 people, have been demanding that the raw data be made public.

The fate of the plane and those on board has become one of the great aviation mysteries of modern times.