Mauersegler,
Yes, I'm an eyewitness(earwitness).
Heard a bang, groundtremble and engine howling that fade in seconds(1-2).
Got info from inside SPL in two mins.
I live in Zwanenburg over 13 years and are become quite an expert on a/c engines while approache landing or climbing. I spot a/c for the (runway)polderbaan and closer for the (runway)Zwanenburgbaan Witch are line up parallel. Just by looking out my backwindow.
Here another interesting pic(url):
Flickr Photo Download: Crash Turkish Airlines TK 1951
Both engines are linedup in front of the aircraft. Closer examination tells the a/c slided a bit to the left as the engines moved straight forward due to the weightforce when snapped of.
Crash Turkish Airlines TK 1951 on Flickr - Photo Sharing!