<p>CIUDAD DEL ESTE, Paraguay (CNN) --The area of South America known as the tri-border region, which drew the attention of antiterrorism experts after September 11, has again become a point of concern.</p>
<p>Sources said the meetings, which took place in and around Ciudad del Este, were attended by representatives of Hezbollah and other groups sympathetic to Osama bin Laden's al Qaeda terrorist network.</p>