A stabbing attack at the main railway station in the German city of Hamburg left multiple people injured on Friday.
Emergency services said 17 people were injured in the attack, though police later increased this number to 18.
Four people suffered life-threatening injuries and six were seriously injured, officials said.
Hamburg police said they had arrested a 39-year-old woman, a German national, near the scene of the crime on platform 13/14.
The police also do not believe that the stabbing was politically motivated, and appeared to be more of a random act. Investigators were looking into whether the suspect may have been mentally ill, police spokesperson Florian Abbenseth said.
The German national is set to be brought before a judge on Saturday, a police spokesman
told the news agency dpa, adding that the woman remains in police custody.
Germany's rail operator Deutsche Bahn has said train services to the station were disrupted by the police operation, warning of "delays and partial cancellations."
The attack occurred during rush hour at the station, which is one of the busiest in the country.