One scientist, knowing that it would be coming down in the middle of the sparsely populated desert, contacted KLM Airlines, who he knew flew in that area. Two pilots on a Johannesburg to Amsterdam flight got the message and at the predicted time, kept a look out for the meteor, and though they didn't see the actual explosion after it entered the atmosphere, they did see the bright glow of it over the horizon.
I had read somewhere they found diamonds or diamond like material in the asteroid, but now that article is gone????