An alleged Dutch-born Islamic State militant went on trial in the Netherlands on Monday for war crimes in Iraq and Syria, including breaches of the Geneva Conventions, after posing with a crucified body and sharing images of dead victims online.

It is the first trial in the Netherlands dealing with war crimes by an alleged Islamic State militant.

There is no international tribunal to prosecute widespread atrocities during Syria’s civil war which began on 2011, but prosecutors in several European countries have put on trial nationals who joined militant groups in the Middle East.

According to European police agency Europol, some 5,000 Europeans went to fight in Syria and Iraq, of whom some 1,500 have returned. Roughly 300 Dutch nationals joined the armed fight in Iraq and Syria, prosecutors said.

Read more: Reuters