Pro-Russian separatists within Eastern Ukraine claimed on Thursday that they found the “black box” flight data recorder from the crashed Malaysia Airlines Flight MH17, according to Reuters.

While unconfirmed, some reports indicate that the airliner may have been downed by a Buk surface-to-air missile.

All 295 passengers and crew members onboard the Boeing 777 were killed after the airliner crashed near the city of Donetsk, Ukraine.

According to Interfax, the separatist plan to turn over the black box to Russian authorities.