Updated

The Dutch Safety Board says it will push ahead with an investigation into the cause of the Malaysia Airlines Flight 17 disaster, despite not being able to access the site where the plane went down in eastern Ukraine.

Flight 17 was shot down July 17 above an area held by pro-Russia separatist rebels, killing all 298 aboard.

The board said Monday it is also investigating whether flight routes over the area should have been left open to civilian air traffic. However, it won't "assign blame or responsibility" in its conclusions. The board says it expects to release a preliminary report in several weeks containing information from the plane's cockpit voice recorder, radar analysis and satellite photos.

The multinational investigation has now shifted its headquarters from Ukraine to The Hague, Netherlands.