German Train Horror: Axe Rampage Injures More Than 20

An axe-wielding madman attacked a German passenger train -- and more than 20 people were injured ... and several could die.

The horrifying scene played out aboard a train outside the city of Wurzburg. The train line was immediately shut down ... and police responded on foot and with helicopters above.

Police reportedly shot and killed the suspect -- a 17-year-old, originally from Afghanistan -- as he was trying to flee from the train.

At least 3 of the victims are battling life threatening injuries.