The Post reported that a malfunction in Mir's attitude-control system also occurred in March, causing it to list until an alternate back-up system was activated.

CENTERFORSECURITYPOLICY: Center For Security Policy

Entergy told New Orleans City Council members that the company still doesn't know why the device triggered, but the relay has been removed, the dome's electrical system is ready to go and steps will be taken to ensure a malfunction doesn't happen again.

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Saturday's failure was caused by a software malfunction, while the error earlier in the month, which caused the system to shut down for 20 minutes, was caused by incorrect input by an adjoining air traffic control center.

CNN: Software glitch delays London flights