An in-flight break up during reentry into the atmosphere on 1 February killed all seven crew members and disintegrated "Columbia". Immediately after the disaster, NASA convened the "Columbia" Accident Investigation Board to determine the cause of the disintegration. The source of the failure was determined to have been caused by a piece of foam that broke off during launch and damaged the thermal protection system (reinforced carbon-carbon panels and thermal protection tiles) on the leading edge of the orbiter's left wing. During re-entry the damaged wing slowly overheated and came apart, eventually leading to loss of control and disintegration of the vehicle. The cockpit window frame is now exhibited in a memorial inside the Space Shuttle "Atlantis" Pavilion at the Kennedy Space Center.