BAGHDAD , Iraq ( CNN ) -- 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 . An image taken from a video issued in April shows Hannelore Marianne Krause and her son Sinan . 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 said . In early March , Iraqi militants holding Krause and her son hostage demanded that Germany withdraw its troops from Afghanistan to ensure their safety . As part of NATO 's Afghanistan force , Germany sent about 3,000 troops in the relatively peaceful northern part of the country . German troops also help train Iraqi soldiers and police , but not in Iraq . The Arrows of Righteousness group posted video clips on the Internet , threatening to kill the two in 10 days if Berlin did not comply . CNN could not independently confirm the authenticity of the video . In it , the woman identified as Krause urged German Chancellor Angela Merkel to heed the demands . A passport with Krause 's name was shown in the video . While sitting next to her son , Krause tells Merkel , `` These people want to kill my son in front of my eyes , and then they 'll kill me , if the German troops did not withdraw out of Afghanistan . '' She and her son clutch each other and cry as they speak while three militants , two armed with large assault rifles , stand behind the pair . `` They are not joking , and they 'll kill us . I am very tired . Please help me . Take any decision or we will be killed . '' Reading a prepared statement , one of the militants says , `` We have warned you . Otherwise you will not see their bodies . '' `` Muslims are all one nation , and have one religion . It is not acceptable that Germany leads the coalition troops in Afghanistan , and attacks the secured villages and claim it is not fighting in Iraq . '' E-mail to a friend . CNN 's Diana Magnay contributed to this report .
German foreign ministry says woman was released after 155 days . Germany will continue efforts to free her young son , who remains in captivity . In addition , she had demanded that German troops leave Afghanistan .