European authorities are seeking testimony from some of the hundreds of thousands of refugees fleeing Middle East violence as they try to build war crimes cases linked to the conflicts in Syria and Iraq, Reuters reports.
As witnesses to atrocities, they are invaluable to prosecutors preparing trials in European courts that will offer a way round the United Nations impasse that has prevented the setting up of an international court for Syria.
The search for evidence takes a variety of forms. Dutch and German immigration services hand out leaflets to arriving refugees, inviting them to testify. In Norway, police screen arrivals' mobile phones for evidence of possible involvement in war crimes.
"Over the next five years you'll see a lot of prosecutions," said Matevz Pezdirc of the European Union's Genocide Network, a forum that brings together police and prosecutors twice a year in The Hague to swap information about war crimes.
Some alleged perpetrators may be European citizens who have joined Islamic State; others may be militants who have traveled to Europe from Syria or Iraq, blending in with the more than 1 million refugees who streamed into the continent last year.
"You may have lots of victims or witnesses in one place, but you can't move with a prosecution until you have a perpetrator in your jurisdiction," Pezdirc said.
Most European countries have legislation allowing them to prosecute international crimes like genocide regardless of where in the world they happen. About 15 have units dedicated to investigating and prosecuting them.
Over the past decade, authorities in Europe have launched 1,607 international war crimes cases in domestic jurisdictions, while another 1,339 are ongoing, according to EU judicial cooperation agency Eurojust.
Gathering evidence is a painstaking process. Traumatized witnesses, fresh from harrowing journeys on foot and by sea, need time before they are ready to testify, and can often face only short periods of questioning each day.
"The refugees usually need time to rest and calm down before they decide to cooperate with law enforcement," Pezdirc said.
Investigators have interviewed Yazidi Kurd refugees in Germany for evidence of alleged genocide against the ethnic and religious minority. A German citizen thought to be in Syria is the subject of a sealed arrest warrant on separate war crimes charges.
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They are preparing further cases against two other suspects, one accused of torture and another of kidnapping a U.S. legal adviser near Damascus.
In France, genocide and war crimes prosecutors have a handful of investigations open into Syrian nationals, including a former Syrian colonel, once a doctor in a military hospital, who has sought asylum.
More than 4,000 European citizens are estimated to have left to fight in Syria, of whom around a third have since returned home, a Dutch think tank said earlier this year.
With both witnesses and perpetrators on their territory, European prosecutors have already brought some cases. A German citizen is on trial for war crimes after Facebook posts showed him posing alongside decapitated heads.
Last year, Swedish courts convicted a Syrian on the basis of a video showing him torturing a fellow combatant. Crimes being investigated around the continent include torture, murder, rape, crimes against humanity and genocide.