http://www.theatlantic.com/international/archive/2015/01/paris-mayor-to-sue-fox-over-no-go-zone-comments/384656/

Why the Muslim 'No-Go-Zone' Myth Won't Die

There's no evidence of extremist takeover of areas in Europe or the United States. So why do the claims continue?

David A. Graham Jan 20 2015, 

Have you heard about the areas of Europe, or perhaps even of the United States, that are run by jihadists and which non-Muslims can't even enter?
Don't get too worried if you haven't: They don't exist. Or maybe you have, if you watch Fox News or read snippets of Louisiana Governor Bobby Jindal's speech about Islamic extremism. While politics is rife with falsehoods, myths, and baseless rumors, it's often tough to see exactly where a claim comes from, and how it reaches a wider audience—including, for example, a Republican governor with apparent presidential aspirations and a reputation as a sober policy wonk. Here, however, it's possible to follow forensic traces and see how some small elements of truth metastasized into an outlandish claim.
Here's what Jindal said, via CNN:

In the West, non-assimilationist Muslims establish enclaves and carry out as much of Sharia law as they can without regard for the laws of the democratic countries which provided them a new home ....
It is startling to think that any country would allow, even unofficially, for a so called "no-go zone." The idea that a free country would allow for specific areas of its country to operate in an autonomous way that is not free and is in direct opposition to its laws is hard to fathom.http://www.theatlantic.com/international/archive/2015/01/paris-mayor-to-sue-fox-over-no-go-zone-comments/384656/