The U.S-backed Syrian fighters who drove the Islamic State from its last strongholds called Monday for an international tribunal to prosecute hundreds of foreigners rounded up in the nearly five-year campaign against the extremist group.

The administration affiliated with the Kurdish-led Syrian Democratic Forces said such a tribunal is needed “for justice to take its course,” particularly after countries have refused to bring home their detained nationals. The SDF has captured more than 1,000 foreign fighters, including many from Western countries.

“We don’t have other options,” Abdulkerim Umer, a foreign affairs official in the Kurdish-led administration, told The Associated Press. “No one wanted to take the responsibility (of repatriating their nationals). We can’t put up with this burden alone.”

Western countries have largely refused to take back their detained citizens, fearing they would not be able to convict them in civilian courts and that they could pose a security risk. The problem has grown more urgent since President Donald Trump announced his intention to reduce the U.S. military presence in Syria, where American forces are fighting alongside the SDF.

Umer said foreign fighters should be tried where their crimes occurred and where they were detained. “The international community has evaded its responsibility, so we ask that they help us set up the court here,” he said.

The SDF has been fighting IS since 2014 and has retaken large areas in northern and eastern Syria. Its administration is not recognized internationally or by the Syrian government, which has vowed to bring all the country’s territory back under its control.

The Kurdish-led administration has asked the government to grant it autonomy in a new constitution, something Damascus has roundly rejected. Umer said the issue of the foreign detainees is therefore an “exceptional case” that requires an international tribunal. He said the presence of the foreign fighters is a “big problem” that could stoke further instability in the region.

“It is a burden and a risk for us and the international community,” he said.

Kurdish-run courts in northeastern Syria have tried hundreds of Syrians suspected of links to IS. In trials attended by the AP last year, Kurdish authorities showed leniency toward the mostly Arab suspects in a bid to build bridges with the majority Arab population. The courts do not impose the death penalty.

Umer said an international tribunal would help bring the system in line with global norms.

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