“The black box was sent to France for decryption,” RIA Novosti quoted him as saying.
Esmayili previously announced the arrest of several people in connection with the crash of a Ukrainian plane in Tehran.
Ukrainian Boeing 737 of Ukraine International Airlines crashed on January 8 shortly after departure from Tehran. The victims of the crash were 176 people.
On January 11, Tehran admitted that the country's air defense system mistakenly shot down a passenger plane, mistaking it for a cruise missile.