HELSINKI (AP) — An investigation into a small plane crash that killed eight skydivers in Finland could take weeks or longer to complete because the charred remains of the aircraft are scattered over a large area of forest, authorities said Monday.

Two jumpers and the pilot aboard the Comp Air 8 kit aircraft managed to parachute to safety in Sunday’s crash, the head of the investigation, Ismo Aaltonen, said Monday. The three men were hospitalized with minor injuries, and it wasn’t immediately clear when they would be questioned about the crash.