wounded by train stabbing

Two people were injured in a stabbing on board a train from The Hague to Venlo. On Rotterdam Central the wounded got off the train and two others were apprehended.Two people got into a quarrel with two others, which escalated in a stabbing back and forth. The cause of the incident is not yet known. The police do not rule out that they will also take the wounded into custody. NS_DDM_train
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Wikimedia commons The wounded were both stabbed in the abdomen. It is unclear how serious their injuries are. Both people were taken to a hospital