But Aren't There Muslims Across the World?

I read this:-

The United States is shuttering its embassies and consulates throughout the Muslim world on Sunday after receiving an unspecified threat, officials said...they were taking action out of an “abundance of caution.”...

Other U.S. officials said the threat was in the Muslim world, where Sunday is a workday. American diplomatic missions in Europe, Latin America and many other places are closed on Sunday.  Those officials spoke on condition of anonymity because they weren’t authorized to speak publicly about the matter.

and wondered, is this a paternalistic racist attitude that embassies and consulates in other places outside the "Muslim world " will remain open?

And then I thought, but aren't there Muslims all over the world?  Even in ... Boston?

What is going on here?

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What I received:

Emergency Message for U.S. Citizens – August 2, 2013 UPDATE

The Department of State has instructed certain U.S. Embassies and Consulates to remain closed or to suspend operations on Sunday, August 4.  All facilities of the U.S. Consulate General are normally closed to the public on Sundays.  The Consulate General is instructing all U.S. government employees not required for ensuring essential building safety and security not to come into Consulate General facilities for afterhours work on Sunday, August 4.  The Department has been apprised of information that, out of an abundance of caution and care for our employees and others who may be visiting our installations, indicates we should institute these precautionary steps. It is possible we may have additional days of closings as well, depending on our analysis.

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