The Jamestown Foundation's Terrorism Monitor, 22 Sep 08:

Reassessing the Transnational Terrorism-Criminal Link in South America's Tri-Border Area
....although reports regarding al-Qaeda activities in the area are tenuous, the later episodes referring to ongoing Hezbollah operations show that in the aftermath of 9/11 the extent and nature of Hezbollah activities in the area has diminished considerably due to increased law enforcement efforts. However, logistical operations and fundraising are still taking place in the triple frontier. It remains possible that individuals involved in support activities might become operational if ordered to do so. In this sense, the ongoing cooperation between the tri-border countries and the United States has been crucial in keeping illicit activities under tight control in the area, while the push for changes at the legislative level to better regulate terrorism-financing and money laundering-related crimes can also contribute to increasing the effectiveness of law-enforcement operations in the area.