Two trains have collided in southern Poland, leaving six people dead, local officials say, and 50 hurt.
The accident occurred last evening on the Warsaw-Cracow mainline when two express trains, one of which was on the wrong track, collided head-on.
Prime Minister Donald Tusk is on his way to the site of the crash.
The Polish Transport Minister said this appears to be one of the most serious railway accidents in recent years.
Police say some passengers remain trapped in the wreckage.
Helicopter ambulances from Warsaw and Wroclaw are helping to take the injured to hospitals.