A Boeing 737 reportedly veered off the runway at KRK at approx 11 a.m. local time. No casualties according to the only news report so far. Rumour is that the aircraft lost two wheels either on approach or on touching down.
EDIT: Wild exaggeration by the press. Just a flat tyre, as can be seen in this picture:
http://bi.gazeta.pl/im/1/4439/z4439471X.jpg