The Space Shuttle Columbia has disappeared during its landing process at the Kennedy Space Center, causing great concern.
Communication and tracking data have been lost, leaving no information about the whereabouts of the shuttle.
Efforts are being made to locate the shuttle using radar in the Merritt Island area.
No objects or debris have been detected through the radar, raising further uncertainty.
Contingency procedures are being implemented, and all data and notes are being secured by flight controllers at Mission Control.