The Dutch Safety Board is leading the investigation, joined by investigators from Australia and representatives of the Organization for Security and Cooperation in Europe.
MH17 was shot down by a surface-to-air missile on July 17 over an area of Ukraine controlled by Russian-backed separatists. The Ukrainian government has been attempting to re-take control of the area, and entered into an agreement with Australia and the Netherlands to provide civilian police to secure the crash site.
Ukrainian President Petro Poroshenko announced Tuesday the implementation of a unilateral cease-fire in a 20-kilometer radius of the crash site. According to the president's press service, Poroshenko "expects that the OSCE will use its influence on terrorists' ceasing fire in a 20-kilometer radius as well."
It is unclear whether the cease-fire facilitated the investigators' access to the crash site.