This is what the U.S. Embassy says about security of Americans in Argentina.What is the real story?
What are the real dangers?
Where are the safe places?
How much risk is there for expats?
Individuals and organizations with ties to extremist groups, including some known to provide financial support to designated foreign terrorist organizations, operate in Ciudad del Este, Paraguay, in the tri-border area between Brazil, Paraguay and Argentina. No operational terrorist activities have been detected in Argentina, however, and the governments of Argentina, Brazil, and Paraguay are engaged in a coordinated effort, supported by the U.S. Government, to combat illegal activity in that area. Americans crossing from Argentina into Paraguay or Brazil may wish to consult the most recent Consular Information Sheets for those countries.
In recent years, there have been a number of small bomb/incendiary incidents in metropolitan Buenos Aires, Mar del Plata, Santa Fe, and other cities. The bulk of the targets have been bank branches (ATMs), fast food restaurants, and Argentine government-affiliated offices. These incidents usually occurred in the middle of the night and appeared intended to cause only property damage. There has been no indication that these incidents were connected to international terrorism.