A German woman held hostage in Iraq since February has been freed, but her son was still being held, German Foreign Minister Frank-Walter Steinmeier said Wednesday. The woman, Hannelore Marianne Krause, was taken to Germany's embassy in Baghdad after being taken captive with her adult son 155 days earlier. Steinmeier said he was "very relieved" Krause was released on Tuesday, yet there still remains "a great deal of uncertainty" about her son, who "remains in captivity." "Rest assured we will do everything in our power to reach her son, Sinan," the foreign minister was quoted as saying by CNN. In early March, Iraqi insurgents holding Krause and her son hostage demanded that Germany withdraw its troops from Afghanistan to ensure their safety.