Recovery workers in rebel-controlled eastern Ukraine have started collecting debris from the crash site of Malaysia Airlines Flight 17, four months after the plane was brought down.

Sunday's operation is being carried out under the supervision of Dutch investigators and officials from the Organization for Security and Cooperation in Europe. The recovered fragments will be loaded onto trains and ferried to the government-controlled eastern Ukrainian city of Kharkiv, and the investigation into the cause of the crash is being conducted there and in the Netherlands.

All 298 people aboard the Boeing 777 flying from Amsterdam to Kuala Lumpur were killed when it was shot down July 17 over a rebel-held area of Ukraine. Ukraine and the West have blamed the attack on Russia-backed separatists using a ground-to-air missile.