German President Horst Koehler on Wednesday appealed to kidnappers who seized a German woman and her son in Iraq last month to free the two hostages. "I appeal to you to release Frau Krause and her son promptly," the president said in a video message. So much innocent blood has flowed in Iraq ... Let the hostages return to their family." The video was due to be broadcast in Germany and throughout the Middle East on Wednesday.