"Work on the crash site is ongoing. Our Special Monitoring Mission continues to facilitate access to the crash site for the Dutch rescue team," Organization for Security and Co-operation in Europe's Special Monitoring Mission (OSCE SMM) deputy chief Alexander Hug was quoted as saying by the agency.
The expert declined to further comment on the investigation's progress, citing lack of mandate to speak on the issue.
"As soon as authorized bodies are ready to deliver their conclusion, you and I will be notified right away," Hug said.
On July 17, Malaysia Airlines flight MH17 en route from Amsterdam to Kuala Lumpur crashed in eastern Ukraine, killing all 298 people on board. In September, a Dutch Safety Board preliminary report implied that the Boeing 777 was crippled by a number of high-energy objects.
Washington and Kiev were quick to accuse regional militias of shooting down the aircraft with a Buk missile system, but the claims have never been confirmed as local independence supporters argued they did not have means capable of shooting down targets flying at that altitude.
Last month, a former Ukrainian airbase employee alleged that the airliner had been shut down by a Ukrainian Su-25 carrying an air-to-air missile. The witness also identified the jet's pilot. However, his claims have been questioned by the Ukrainian Security Service, which argued that the employee was off duty on the day of the tragedy.
