Speculation as to who is the ‘nation of the cross’ spans from Denmark (flag with cross) to ‘community of Christendom'(all Christian nations). This announcement came after the Denmark attacks yesterday, so is not a reference to yesterday’s attacks.

In August of last year, the leader of ISIS, al-Baghdadi, called the U.S. the ‘Defenders of the Cross’. That might seem a truly ironic designation to us, but the U.S., and the Western coalition in general, is usually referred to as “Crusaders” by ISIS.

Denmark had received threats after the Paris attacks and before the attacks yesterday:
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Yesterday they released a nine minute video named “A Message to Franceā€, threatening France and Belgium, claiming ISIS-linked elements are stationed throughout the two European countries awaiting instructions to launch attacks.

Update:

Here’s what they meant by the message. They beheaded 21 Egyptian Coptic Christians and declared war on Christians, which in their mind, includes us.

HT: Solemn Watch, Liberty Lynx