The German interior ministry has admitted that the number of fighters who have traveled from Germany to Syria and Iraq increased in 2017.
In response to a parliamentary questionnaire submitted by the Left party, the ministry said at least 249 people have traveled from Germany to both countries.
The number of those heading to fight alongside Kurds between April and December 2017 reached 45. While 204 people, including 69 Germans, joined different terrorist organizations in the two countries last year.
Twenty-one of those who embarked on the journey on fight alongside Kurds against ISIS were killed, it said.
It added that 22 of those supporting Kurds in Iraq and Syria have returned. They are part of 124 people who have returned to Germany after fighting in the two countries.
The number of those joining terrorist groups in Syria and Iraq had dropped significantly in 2016.
Ulla Jelpke, one of the Left party politicians who submitted the questionnaire, was highly critical of the interior ministry for considering Kurdish fighters as terrorists.
"The fact that ISIS has been pushed back is thanks, in great part, to Kurdish YPG ground troops and their volunteer supporters. To investigate them for being members of a terrorist organization upon return is just grotesque," said Jelpke.
German newspaper Neue Osnabrücker Zeitung quoted police as saying that the judiciary has opened an investigation into many terror-related cases on returnees from Syria and Iraq.
The prosecution has accused 27 of them of belonging to a terrorist organization. But dropped charges against 16 because of lack of evidence.