Investigators sifting through the wreckage of the Malaysian jetliner shot down from the sky Thursday above Ukraine will face more than the obvious threat of their personal safety, as armed fighters and looters are also flocking to the site of the crash, NBC News reported. The site is a political battleground that will attract Ukrainian security forces and rebel fighters alike who want to appear in charge of the probe, said Matt Robinson, a member of the International Society of Air Safety Investigators. Pro-Russian separatists claimed to have recovered most of the jet's black boxes and had not yet decided what to do with them, The Associated Press reported early Friday.