A violent knife attack occurred at a train station in Hamburg, Germany, resulting in at least 18 people injured, with four individuals critically hurt. A 39-year-old woman has been arrested in connection with the incident, which has led to a significant police operation at the scene. Authorities are investigating the circumstances surrounding the attack as several victims were treated for their injuries, with reports indicating that multiple people suffered severe wounds. The community is in shock as details continue to emerge from this disturbing event.