During her time in office, she played a crucial role in Germany's fight against terrorism. In April 2007, Harms announced that the government would not pursue charges against Donald Rumsfeld and 11 other U.S. officials in connection with the Abu Ghraib torture and prisoner abuse scandal, stating the accusations did not apply, in part because there was insufficient evidence that the acts occurred on German soil, and because the accused did not live in Germany. In September 2007, following a six-month investigation, her office stopped a major terrorist attack against American and German targets by arresting three Islamic militants and seizing a large amount of potentially explosive chemicals and military-grade detonators.