A teenage girl went on trial in Germany on Thursday accused of stabbing a policeman at a train station in Hanover on the orders of the Daesh terrorist group.

Federal prosecutors say the German-Moroccan dual citizen, identified only as Safia S. in line with German privacy rules, traveled to Istanbul in January hoping to reach Syria but was brought back by her mother — though not before Daesh members tasked her with conducting an "act of martyrdom" in Germany. The stabbing occurred in February at Hannover's main train station.

She went on trial at the Celle state court Thursday, charged with attempted murder and supporting a foreign terrorist organization.

Judges excluded the public from the proceedings, news agency dpa reported.After being returned to Germany, Safia S. contacted Daesh members online and asked them to help her plan an attack, prosecutors have said.A 20-year-old German Syrian is also standing trial in the same case. Prosecutors believe Mohamad K. knew of Safia's plan to carry out the attack and did not inform the police.