The US section of the International Space Station Has Been Evacuated.

According to Roscosmos an ammonia leak in the US section of the International Space Station has necessitated the evacuation of that section of the station.  
From what I have read this diagram depicts where the no-go zone is. 


Image courtesy of the Russian Space Agency Roscosmos.  

To put this in perspective consider the following.  If you spill some strong amonia in your house you open a window.  In space you cannot do that.  So to fix this someone may need to put on a space suit, and work in tight quarters to patch the leak.  If the leak cannot be patched then the amonia will stay in that part of the station unless there is some way to suck all the air out, and replace it.  But to replace that atmosphere would not be a simple task.  

Here is what Nasa is tweeting about it

Hopefully this is just a bad sensor reading or something. Otherwise things could get very interesting aboard the ISS.

UPDATE
False sensor reading. 

The leak was determined to not be super serious if it was real. After sampling the air directly no indication of an Ammonia leak. In a situation where you can't open a window an overabundance of caution is called for.

Old NID
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