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The Islamic State called for attacks in Berlin and Brussels in order to "paralyze" Europe in the wake of the historic Brexit vote. 

Voters in the United Kingdom decided Thursday to leave the European Union, causing ISIS to tout the negative economic effects of the decision. 

The message reportedly came via an encrypted communication service often used by ISIS fighters and supporters.

Trace Gallagher reported on The Real Story this afternoon on the potential security impact of the Brexit vote. 

He said that a bedrock EU principle is open borders, which allows some 400 million people to move about freely. That policy, however, has been criticized following the terror attacks in Paris and Brussels and a foiled attack last summer on a Paris-bound train. 

The ringleader of that terror cell easily went from Brussels to Paris, then back to Brussels, where he hid out for four months. 

Investigators believe the same cell perpetrated both attacks. 

Gallagher noted that European privacy laws limit authorities in different countries from sharing information about possible threats. 

Watch the full report above.

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