Yes. Of special note is the "terrorist triangle" area of Argentina, Brazil and Paraguay. The article linked below notes the large influx of Muslims to that area who carried European passports but were unable to even speak the language of the European country they supposedly came from.
http://www.worldnetdaily.com/news/article.asp?ARTICLE_ID=35881
From the link above:
"...A German agent of the Bundes Nachrichten Dienst - Federal Information Service who recently visited a number of Latin American capitals has evaluated the situation in the triple border area as "a ticking time bomb." He believes the growing pressure exercised on terrorists in Europe, Asia and North America will bring many of them to move their organizational apparatus to countries such as Paraguay."
"...Muslims have also found their way into Bolivia, Colombia, Brazil and other neighboring countries..."
"...At this stage the growing danger is that of militant Islam penetrating Mexico, a country with an increasing Muslim community, including Muslim converts. Some of them have ties to the Mexican community and to illegal immigrants' smugglers operating in American states bordering Mexico, especially those with connections in the greater Los Angeles area and other major cities.
Intelligence experts now assume the so-called jihadi spider web is moving north fast from Paraguay. It is just a question of time before terrorists use, and quite possibly already have used, the loosely guarded American-Mexican border..." (excerpts)