MOSCOW (Sputnik) — Wim de Bruin told RIA Novosti that the criminal investigation of the crash is very complex as it has to be concluded in a conflict zone, and the crash site was long inaccessible for investigators.
"The Joint Investigation team is focusing on several scenarios. The most likely is the one in which the MH17 was downed by a ground-to-air missile. But there are still [other] scenarios that can't be excluded. For example the air-to-air scenario," Wim de Bruin told RIA Novosti.
Kiev blamed the Donbass independence supporters in eastern Ukraine for shooting down the plane. However, Donbass militia insisted that they did not possess weapons capable of bringing down an aircraft flying at 32,000 feet. Russia has repeatedly stressed the importance of a transparent international investigation into the tragedy.
The Dutch Safety Board is due to release a final report on the tragedy in October 2015.