(PORTLAND, Ore.) — Boeing overwrote surveillance footage from the repair facility where a door plug was reinstalled ahead of the blowout on an Alaska Airlines flight earlier this year, according to a letter Wednesday from National Transportation Safety Board Chairman Jennifer Homendy to the Senate Commerce Committee.

The NTSB has been requesting the footage in order to investigate what happened during the midflight scare.

The NTSB still does not know which Boeing employees worked on the failed door plug of Alaska Airlines 1282, which had its door plug blow out during a flight in January, Homendy also said in the letter.

“To date, we still do not know who performed the work to open, reinstall, and close the door plug on the accident aircraft,” Homendy wrote to Sens. Maria Cantwell and Ted Cruz. “Boeing has informed us that they are unable to find the records documenting this work.”

This is a developing story. Please check back for updates.

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