The Islamic State has opened a “marriage bureau” for women who want to wed militants in its “caliphate” spanning northern Syria and Iraq.

The bureau, operating out of Al-Bab, in northern Syria, is designed for “single women and widows who would like to marry IS fighters,” the U.K.-based Syrian Observatory for Human Rights told Agence France-Presse.

Citing residents, the organization said women were asked to register with the office, “and IS fighters will come knocking at their door and officially ask for marriage.”

The Islamic State has seized large swaths of northern and eastern Syria, the Iraq-Syria border, and parts of northern and western Iraq, establishing a so-called “caliphate,” AFP reported.

The Islamic State has began offering tourism in the territory, taking jihadists on honeymoons and running semiweekly tours from Syria’s Raqa to Iraq’s Anbar, AFP reported.

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