Here are some eyewitness accounts:
http://news.bbc.co.uk/2/hi/europe/7910372.stm
It sounds like it just dropped out of the sky on final approach. One eyewitness said that it was very nose-high when it hit the ground, and a survivor said the plane dropped quickly and suddenly, like they were in turbulence or just fell into a void. To me that sounds like a stall or windshear, but the latter is unlikely because there wasn't any wind.
Either way, the survivors are very lucky. The plane came down with wings level and the tail down in a soft, open, level field. Without any of those factors, it would have been a lot worse. Still, it's tragic that there were fatalities.