Record-wide Number From Muslim World Became Swedish Citizens

In spring 2016, an alleged Islamic State fighter named Ahmed Musto returned from Syria, settled into a business processing tobacco for hookah pipes in the Bulgarian capital and started a family, according to court documents and Bulgarian authorities.

Last September, authorities raided the business and arrested Mr. Musto. Far from leaving the militant group behind, Mr. Musto sent proceeds from the business to Islamic State in Syria, according to law-enforcement officials.

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