The investigation into the loss of Malaysia Airlines Flight MH17 over eastern Ukraine a little more than a year ago has uncovered several “parts” thought to have come from a Buk anti-aircraft missile system, according to the Dutch Safety Board (DSB), which is leading the crash probe. But at present the board has made no “causal connection” between the missile parts and the crash.

Discovered in eastern Ukraine during a previous recovery mission, the parts were being examined by the safety board and a multinational Joint Investigation Team (JIT) that is leading a separate criminal investigation into the airliner crash.

“The parts are of particular interest to the criminal investigation as they can possibly provide more information about who was involved in the crash of MH17,” the DSB said in an August 11 release. “For that reason the JIT [will further investigate] the origin of these parts. The JIT will internationally enlist the help of experts, among others forensic specialists and weapons experts.”

MH17, a Boeing 777-200, broke apart over the contested region of Ukraine on July 17, 2014, while flying from Amsterdam to Kuala Lumpur. All 298 people on board were killed. The DSB released a preliminary report in September that found the aircraft had been struck by “a large number of high-energy objects,” indicating that a missile warhead exploded nearby.

Western authorities suspect that MH17 was shot down by Russian-backed separatists fighting for ground in eastern Ukraine; Russia has cast blame on the Ukranian military. U.S. and NATO intelligence sources have claimed that the suspected missile came from a Russian-made Buk-1M mobile surface-to-air missile defense system, known to NATO as the SA-11 Gadfly.

The DSB announced on August 10 that it is leading a multi-day meeting on the progress of the crash probe involving aviation specialists from the Netherlands, Ukraine, Malaysia, Australia, the U.S., the UK and the Russian Federation. The investigators plan to visit Gilze-Rijen Air Base in the Netherlands to view a reconstruction of part of the down aircraft.