I am not sure if this alone is proof of anything. Having thought about it for some time and originally I believed this signalled it may have been a terror-related event I now am not so sure.
A religious Jew is commanded to say the Shema prayer every day (in services and upon waking and going to sleep) and we also are commanded to say it just before we believe we are about to die. To me at least Shema is a prayer similar to the muslim cry of 'alla akbar' in that it establishes our belief in Hashem, and our trust that he is the ONLY power in all of creation. I do not know if muslims also have such a command or custom... This is why I am not going to immediately believe that by saying this (right before dying) it is a terror event.
Maybe someone can explain I am wrong about this muslim cry.