A teenage Afghan refugee armed with an axe and knife injured four people on a train in southern Germany before being shot dead by police, officials say.
Three people were seriously hurt and one suffered minor injuries in the attack in Wurzburg, police said. Another 14 were treated for shock.
Bavarian Interior Minister Joachim Herrmann said the attacker was killed as he tried to flee the scene.
The motive for the attack is not yet clear.
The injured include members of a family from Hong Kong, authorities there said, although their exact condition was not revealed.
Mr Herrmann said the attacker was a 17-year-old Afghan refugee who had been living in the nearby town of Ochsenfurt.
He told public broadcaster ARD that the teenager appeared to have travelled to Germany as an unaccompanied minor.
Mr Herrmann said authorities were looking into reports that the attacker had yelled out "an exclamation". Some witnesses quoted by German media said they had heard him shout "Allahu akbar" ("God is great") during the attack.
