Egyptian authorities are analyzing flight recorder data files from an EgyptAir flight that crashed with 66 people aboard but say it will take several days to reach any conclusions.

The memory cards of the flight’s black box recorders were retrieved from the Mediterranean seafloor and sent to France’s BEA air accident investigation agency for cleaning and repair.

The recorders may explain what caused the crash of the Paris to Cairo flight on May 19.

The data recorder’s repaired memory card was sent back to Cairo on Tuesday but the BEA says in a statement citing Egyptian authorities that “it might take several days to ensure the accuracy of reading the data recorded.”

The statement says the voice recorder’s memory card is still being repaired in France.

(AP)