Anton Gerashenko, an adviser to Ukraine's Interior Minister told The Associated press that the plane, carrying 280 passengers and 15 crew people onboard, was shot down.
Gerashenko says on his Facebook page the plane was flying at an altitude of 33,000 feet when it was hit Thursday by a missile fired from a Buk launcher. A similar launcher was seen by Associated Press journalists near the eastern Ukrainian town of Snizhne earlier Thursday.
The adviser also told Russian news agency Interfax that all onboard have been killed.