United States Special Operations troops advising the Kurdish-led militia known as the Syrian Democratic Forces are cataloging fingerprints and other so-called biometrics of many of the estimated 200 to 300 detainees in at least three camps near Raqqa. The American forces also are interrogating the detainees to learn more about foreign fighter networks and threats to their home countries.
But American military officials see parallels with the Iraq war, in which militants, including Abu Bakr al-Baghdadi, the current leader of the Islamic State, were held for years at Camp Bucca, a sprawling American detention facility on the Kuwaiti border where they became more radicalized.
“Clearly, we’ve seen what happens when you have a group of highly trained, terrorist fighters held in detention for a long time,” Col. Ryan Dillon, a spokesman for the American-led military coalition in Baghdad, said in a telephone interview. “We don’t want to see that, and it’s something we’re addressing.”
If so, the initial efforts appear tentative.
The Trump administration has quietly established an interagency working group, including officials from the State, Defense and Justice Departments, to help the Syrian Kurds deal with the problem. But American officials seem to want to wash their hands of the growing problem, despite the potential security and humanitarian risks.
“Foreigners who take up arms in Iraq and Syria and are subsequently captured in the field are not necessarily turned over to the coalition, nor is there any requirement for the coalition to be notified,” the American-led military coalition in Baghdad said in an email.
Marc Raimondi, a spokesman for the White House’s National Security Council, referred all questions to the State Department. When asked for comment, the State Department said in an email: “We are working to address issues related to ISIS fighters detained in other countries. This includes discussions with foreign partners.”
International relief organizations are seeking more information about conditions in the camps over the long term, particularly on widows and children of suspected fighters. “In Syria, we are involved in ongoing discussions with regard to detention access,” said Marc Kilstein, a spokesman for the International Committee for the Red Cross in Washington, who declined to provide details to avoid jeopardizing its work in the region.
A Kurdish journalist, Arin Sheikhmus, 30, said he had visited three camps where Arab, Asian and European “war prisoners” were being held. He said he had seen as many as 100 women and children who had been taken into custody to be turned over to their home countries, including Russia, Indonesia and Kazakhstan. In at least one of the camps, a large number of the prisoners were suspected fighters from Tunisia, a United States official said.
Mostapha Bali, a spokesman for the Syrian Democratic Forces, said conditions in the camps met international standards, especially for women and children. He said Kurdish authorities were sorting out which detainees were actual combatants and which were local civilians pressed by the Islamic State into administrative or medical jobs, and could be safely released.
“Those who were involved in bloodshed and fighting will be submitted to trial and will be punished, but those who joined Daesh and worked in civil sectors, like medicine, nursing and municipalities,” will be adjudicated by tribal mediation panels, he said, referring to another name for the Islamic State.
Mr. Bali said about 400 Syrians had been released through this process, and added that Kurdish authorities were trying to repatriate other prisoners to their home countries. But that effort is facing strong headwinds.
“Some countries showed more interest than others in extraditing their citizens,” said Nouri Mahmoud, a Kurdish spokesman. “European governments so far have been reluctant to reach out to us in order to extradite their citizens.”
Khaled al-Ibrahim, a lawyer who represents defendants in a special terrorism court that Kurdish authorities call People’s Defense Court, defended in WhatsApp messages the justice that is being administered to the suspected Islamic State fighters.
“Any defendant can be assigned a lawyer to take their case,” he said. “Verdicts come after court sessions and evidence presented. We don’t have the death sentence in the Northern Syria federation. We don’t torture or get confessions by force. Our prisons are correctional facilities.”
Even as Kurdish authorities, American officials and relief organizations seek to address the Islamic State prisoners in custody, broader concerns remain about those fighters still at large.
Some 40,000 fighters from more than 120 countries poured into the battles in Syria and Iraq over the past four years, American and other Western officials say. While thousands died on the battlefield, officials say many thousands more probably survived to slip away to conflicts in Libya, Yemen or the Philippines, or have gone into hiding in countries like Turkey. About 295 Americans are believed to have traveled to Iraq or Syria, or tried to, American officials said.
Of more than 5,000 Europeans who joined those ranks, as many as 1,500 have returned home, including many women and children, and most of the rest are dead or still fighting, according to Gilles de Kerchove, the European Union’s top counterterrorism official.
European intelligence services, along with Interpol, have created major new databases of suspected foreign fighters. European spy agencies and Europol have also created counterterrorism hubs in the Netherlands for sharing information and mapping out strategy.
The United Nations Security Council last month unanimously approved a resolution requiring all nations to collect airline passenger data, maintain watch lists of known and suspected terrorists, and collect biometrics, such as fingerprints, to help spot foreign fighters if they attempt to board planes.
In the field, American warplanes and Kurdish-led ground forces are hunting for the roughly 1,000 remaining Islamic State fighters hiding along the Euphrates River valley near the border with Syria and Iraq. American counterterrorism officials believe Mr. Baghdadi is most likely hiding in these Sunni border areas straddling the two countries.
In a Senate hearing this month, David M. Satterfield, the State Department’s acting top Middle East diplomat, warned that Islamic State operatives still posed a threat. “Many of its core leadership and cadre avoided the fight,” he said. “They remain present and they remain coherent.”