Check out the four FLIR Project videos
What propellant is used in these rounds?
What is the IR emission spectrum of these rounds (as seen from the muzzle) when they are fired?
What is the IR spectrum of sunlight reflecting off of various types of broken glass?
Find these out; then film each of the above through an FLIR system such as in the video -- see if one can tell them apart.
Is it too late to look for spent rounds on the site of the mass death? (There shouldn't have been too many OTHER military/high-performance rounds scattered about the area since then, unless it has since been converted into a shooting range, right?)
NO cheers, unfortunately.
Very interesting videos - thanks for the link.