Russian military officials said Monday they would call on more specialists to help decipher the damaged black box of a warplane shot down by Turkey after a first attempt to read the device failed, AFP reports.

"Reading the memory cards is not yet possible due to internal damage," said Sergei Bainetov, the deputy head of flight safety in the Russian armed forces, RIA Novosti reported.

"The commission is contemplating calling upon specialised Russian research institutions, which have the ability to extract information directly from the microchips' crystals."