German authorities have launched an investigation into a solo attack at Hamburg’s main train station, which left several people injured. According to the police, a 39-year-old woman is the primary suspect and initial findings suggest she acted alone.

The authorities are still gathering information and have not provided an exact number of injured individuals, although reports indicate that several people are in a life-threatening condition. Initial media reports had suggested as many as 12 people were hurt, but the accuracy of this figure has not been confirmed.

The motive behind the alleged attacker’s actions remains unknown at this time.