BBCTwelve people have been injured in a knife attack at the main railway station in the German city of Hamburg, local media is reporting.
Local media reports say three of the victims are in critical condition, with three others seriously injured.
Police say they have arrested a suspect and a major operation is under way.
The attack is understood to have happened at Hamburg's Central Station at around 18:00 local time (17:00 BST) on Friday.
A spokesman for the Hamburg fire department told AFP news agency that 12 people had been injured and that some of the injuries were life-threatening.
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