Well from what I saw, it looked like a pretty run down place, with those outdated HRL suits. From Setsuna's reaction, it was probably from that civil war in Sri Lanka. They didn't seem to have too good a technology, and big powers weren't exactly shooting live either. Since that civil war was nothing new, and other assaults may have happened simultaneously, the news-worthiness may not have been worth the risk of sending a crew there, not that either sides were probably interested in being on the news anyway. That suit had full blown "wings", which probably indicated radio jamming, as well as a test for the prototype Solar Furnace. Shooting straight through the cockpits also support the fact that it was out to kill.
Just saying, in a run down and utterly chaotic place, keeping a low profile by killing witnesses isn't too hard, especially with a bit of military might.