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Europol's director Rob Wainwright said as many as 2,500 European-born fighters are likely to be in "various stages of returning" to the continent after joining the Islamic State terrorist group in Iraq and Syria. (Associated Press/File)

Europol's director Rob Wainwright said as many as 2,500 European-born fighters are likely to be in "various stages of returning" to the continent after joining the Islamic State terrorist group in Iraq and Syria. (Associated Press/File)

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