No clue, but the incident seems much more serious, than expected.
As I wrote above, there WAS a Cessna on pattern in Zerniki at that time,
and the planes missed each other just by 300 m laterally and 100 m vertically.
(...just rumour from a witness on a Polish forum...)
I think, there will be a serious investigation into this incident.
The TWR at EPPO has no radar picture of the TMA since few months,
due to modernization.
I was flying EPBC-EPZG a week ago, and they couldn't tell me anything more,
than what was reported to them by other crews...
