"The site is now inside the fire perimeter itself," the fire incident management team said on Saturday. The National Transportation Safety Board will investigate the helicopter crash once their team can examine the wreckage. Officials urged the public not to speculate or spread rumours about the cause at this early stage. In Washington state, the National Park Service closed down access to the Sunrise and White River areas of Mount Rainier National Park after a new wildfire burned less than a square kilometre. The larger fires near Spokane have now burned more than 40 square kilometres, but firefighters have constructed over 120 kilometres of containment line to help control those flames.