An internal voice recorder found among the wreckage of a Boeing-737 passenger plane that crashed in Kazan was damaged, Interfax reports .
"Whether it is suitable for decryption, the IAC will say," said Dmitry Zakharov, senior assistant to the head of the Volga Investigation Department for Transport of the TFR.
The plane crash happened on the evening of November 17th. The crash killed 50 people.